Hi Scott,
Have you debugged it down to the 6809E and are you sure everything else os working correctly?
The reason I ask that, is that I collect many of those classic 8-bit computers and I know that I have several TRS CoCos in my collection, but friends have shared with me that the main issue I will run into with firing up my old computers is that the elecrolytic capacitors do not age well and they will ALL need replacing!
Did you know that and have you done that before determining the issue is with the 6809E?
--- Manny