diff --git a/tests/pac/trend-component-25/example.mod b/tests/pac/trend-component-25/example.mod
index bf609cd22..f6d174e74 100644
--- a/tests/pac/trend-component-25/example.mod
+++ b/tests/pac/trend-component-25/example.mod
@@ -46,7 +46,7 @@ pac_model(auxiliary_model_name=toto, discount=beta, model_name=pacman);
 
 model;
 
-[name='eq:u']
+[name='eq:s']
 s = .3*s(-1) - .1*s(-2) + es;
 
 [name='eq:diff(v)']
diff --git a/tests/pac/trend-component-26/example.mod b/tests/pac/trend-component-26/example.mod
index cb8f53123..e88b11899 100644
--- a/tests/pac/trend-component-26/example.mod
+++ b/tests/pac/trend-component-26/example.mod
@@ -49,7 +49,7 @@ pac_model(auxiliary_model_name=toto, discount=beta, model_name=pacman);
 
 model;
 
-[name='eq:u']
+[name='eq:s']
 s = .3*s(-1) - .1*s(-2) + es;
 
 [name='eq:diff(v)']
diff --git a/tests/pac/trend-component-27/example.mod b/tests/pac/trend-component-27/example.mod
index 835159ddd..269d12e1d 100644
--- a/tests/pac/trend-component-27/example.mod
+++ b/tests/pac/trend-component-27/example.mod
@@ -58,7 +58,7 @@ pac_model(auxiliary_model_name=toto, discount=beta, model_name=pacman);
 
 model;
 
-[name='eq:u']
+[name='eq:s']
 s = .3*s(-1) - .1*s(-2) + es;
 
 [name='eq:diff(v)']
diff --git a/tests/pac/trend-component-28/example1.mod b/tests/pac/trend-component-28/example1.mod
index db3a39cb8..d42c87c6f 100644
--- a/tests/pac/trend-component-28/example1.mod
+++ b/tests/pac/trend-component-28/example1.mod
@@ -63,7 +63,7 @@ pac_model(auxiliary_model_name=toto, discount=beta, model_name=pacman);
 
 model;
 
-[name='eq:u']
+[name='eq:s']
 s = .3*s(-1) - .1*s(-2) + es;
 
 [name='eq:diff(v)']
diff --git a/tests/pac/trend-component-28/example2.mod b/tests/pac/trend-component-28/example2.mod
index 274a90b69..9034fb10f 100644
--- a/tests/pac/trend-component-28/example2.mod
+++ b/tests/pac/trend-component-28/example2.mod
@@ -63,7 +63,7 @@ pac_model(auxiliary_model_name=toto, discount=beta, model_name=pacman);
 
 model;
 
-[name='eq:u']
+[name='eq:s']
 s = .3*s(-1) - .1*s(-2) + es;
 
 [name='eq:diff(v)']
diff --git a/tests/pac/trend-component-28/example3.mod b/tests/pac/trend-component-28/example3.mod
index 45c53f18d..9a74a10b8 100644
--- a/tests/pac/trend-component-28/example3.mod
+++ b/tests/pac/trend-component-28/example3.mod
@@ -63,7 +63,7 @@ pac_model(auxiliary_model_name=toto, discount=beta, model_name=pacman);
 
 model;
 
-[name='eq:u']
+[name='eq:s']
 s = .3*s(-1) - .1*s(-2) + es;
 
 [name='eq:diff(v)']
diff --git a/tests/pac/trend-component-28/example4.mod b/tests/pac/trend-component-28/example4.mod
index de1b8d9b7..5fced3966 100644
--- a/tests/pac/trend-component-28/example4.mod
+++ b/tests/pac/trend-component-28/example4.mod
@@ -63,7 +63,7 @@ pac_model(auxiliary_model_name=toto, discount=beta, model_name=pacman);
 
 model;
 
-[name='eq:u']
+[name='eq:s']
 s = .3*s(-1) - .1*s(-2) + es;
 
 [name='eq:diff(v)']
diff --git a/tests/pac/trend-component-28/example5.mod b/tests/pac/trend-component-28/example5.mod
index 08a0d9b51..e7226aab4 100644
--- a/tests/pac/trend-component-28/example5.mod
+++ b/tests/pac/trend-component-28/example5.mod
@@ -63,7 +63,7 @@ pac_model(auxiliary_model_name=toto, discount=beta, model_name=pacman);
 
 model;
 
-[name='eq:u']
+[name='eq:s']
 s = .3*s(-1) - .1*s(-2) + es;
 
 [name='eq:diff(v)']
diff --git a/tests/pac/trend-component-28/example6.mod b/tests/pac/trend-component-28/example6.mod
index 2e20cd199..19e64c55a 100644
--- a/tests/pac/trend-component-28/example6.mod
+++ b/tests/pac/trend-component-28/example6.mod
@@ -63,7 +63,7 @@ pac_model(auxiliary_model_name=toto, discount=beta, model_name=pacman);
 
 model;
 
-[name='eq:u']
+[name='eq:s']
 s = .3*s(-1) - .1*s(-2) + es;
 
 [name='eq:diff(v)']
diff --git a/tests/pac/trend-component-29/example1.mod b/tests/pac/trend-component-29/example1.mod
index bdb9809ad..8870d7afa 100644
--- a/tests/pac/trend-component-29/example1.mod
+++ b/tests/pac/trend-component-29/example1.mod
@@ -58,7 +58,7 @@ pac_model(auxiliary_model_name=toto, discount=beta, model_name=pacman);
 
 model;
 
-[name='eq:u']
+[name='eq:s']
 s = .3*s(-1) - .1*s(-2) + es;
 
 [name='eq:diff(v)']
diff --git a/tests/pac/trend-component-29/example2.mod b/tests/pac/trend-component-29/example2.mod
index 93d285dfb..6a9a6c5c7 100644
--- a/tests/pac/trend-component-29/example2.mod
+++ b/tests/pac/trend-component-29/example2.mod
@@ -58,7 +58,7 @@ pac_model(auxiliary_model_name=toto, discount=beta, model_name=pacman);
 
 model;
 
-[name='eq:u']
+[name='eq:s']
 s = .3*s(-1) - .1*s(-2) + es;
 
 [name='eq:diff(v)']