Piper Electric Trim

I have a 75 Pathfinder and I am trying to get some info on the Piper Electric Trim (PET) system. I'm usually pretty good at scouring the internet but I am unable to find much info on this. Does anybody have a PDF of the Piper Pitch Trim System Service Manual? I'm not even sure which version of the PET I have. I just know it keeps popping the circuit breaker.

Rob