I exposed the plug connecting the switch to the mirror and removed the mirror itself without a hitch. Great
Testing the plug itself according to the info supplied by hookedon210s was the next stage and I have a question here. I get 12v at pins 1-3 and 1-5 when activating the switch in one direction only. (i.e.- going left 12v, going right - nothing. reversing the polarity on the meter does not effect that at all. same result when going up/down- one direction only) is this correct or is the switch bad ?
I next removed the glass assembly of the mirror and stared at the motors - It looks a lot darker in that dungeon than the photos indicate !!!. I will wait for help regarding my "switch" question, before tearing into the motors and really messing up.....