PFA Lash Up Difficulty

I mix stuff all the time and have not run into this. I don't have many with passenger sounds. I did have an engine with a bad sound set loaded. It needed to be reloaded.

Are you saying that the 1066 will play the whole PFA on it's own and end without this issue?

What are you using for control? The remote or the app?

Do you have 6.1 loaded into both the remote(if used) and the TIU?

Yes, on it's own the 1066 goes through the whole PFA just fine.
I'm using a remote and both the remote and the TIU have been update to 6.1.

Have an MTH diesel that emits a screeching noise sometimes for no reason and you cannot stop it. Have no idea why it does so, until this thought it was the only one.

Now I'll have to test making sure I mix a freight and a diesel engine's sound set in a train. I just haven't seen this one. I am not a tech.

This one is above my pay grade! I find it interesting.

 I have heard the screech. When it occurred, I thought it was coming from the smoke unit. I had just upgraded an Aristo Dash 9 in G scale to PS2. I made the mistake of moving wires while the engine was running. A loose switches' wire touched ground and fried the board. GGG fixed it. It never screeched again. I never touch stuff on powered track anymore!! Expensive lesson.

 The other time it happened I simply changed the sound set. I think both were PS2 models???

It appears that was 7 years ago.

In case anybody has any ideas or has a similar problem and stumbles 

I did some more testing and added another engine CUT P-motor #209 which also has passenger effects.

-The 1066 is the only engine to suffer this screaching (which seems to possibly be it trying to play all of it's sound files at once).
-The issue only seems to present itself when exiting a PFA sequence when the 1066 is trailing one of the steam engines.
-Does not occur when the 1066 is leading a consist or when it follows the P-motor.
-With the exception of the PFA issue, all consists respond to all commands and operate correctly.
-I tried deleting and recreating the consists with no change.

At this point I'm chocking it up to some programing edge case that's going to be tallied under "Operational Restrictions"