Hi David....
Thanks for the info. It's just odd that the "ghost" commands have never occurred on this engine (or any other engine) before; until after the derailment.
I've been meaning to assemble the TIU Tester anyway. This situation just "lit the proverbial fire..." to get that done.
Hey GRJ....
Thanks for the follow up and the testing procedure. Question on Step 4 - "Jumper all input channels together." In my configuration I have each channel powered by its own PW ZW. It's this config acceptable or just go with the the channel jumpering using one ZW?