So this blog is a little late considering the time covered.
Monday after 7QP I head over to HRO to test out my IC-7100 and figure out what went wrong. Reset all the menu items to match the HRO 7100. Still no SSB modulation. Swap parts around. Whatever is wrong is in the base unit.
Attach wattmeter and try AM. No modulation but carrier is present. So mike works, I can record audio but I cannot modulate the carrier. Just about to pack it in and send it to Icom when last try, full reset.
Magic happens. Radio now works. Some non-configurable register is blocking the modulation.
Worse, I knew about the full reset (I tried soft reset just above on Saturday) and did not try it.
My own fault. Next time I know to do the full monty. Yeah next time for sure.