Update 9/11/17
I was able to spend an hour or so with the owner this morning trying a few of the suggestions you all listed previously. I took an old speaker I had laying around to test. I hooked it up to the P8 and I got static, we started the throttle and we got chuff, we pressed 1 and got the bell and pressed 2 and got the whistle. WooHoo!!! It turns out the speaker was bad…order new speaker…check! I did notice that the momentary volume switch did not seem to be working as I tried in both directions and the volume didnt change. I think the volume switch is bad and that may have blown the .05w speaker the owner had in there. Order new momentary volume switch…check!
Lights…still dont work. We were getting 10v on both the front and rear light terminals on the G2 board. We did get access to the front headlight bulb and it appears to be burned out. We did get a 10v reading at the socket. Owner wants to upgrade to LED lights at this point. A strange thing happened, when the loco was running on the rollers, when I pressed the 0, there seemed to be a voltage drop as the loco wheels slowed down until I pressed 0 again.
Anyway…we are making progress and the owner is very happy.
To be continued…