You state that you have 0 volts on a pin / no change. I can't help you if your PP is not working. From a MACH point of view,
the PP port must be recognized via the PP address. If your PP port is not working i don't care what you do MACH software wise it is fruitless. The MACH instructions sent to the PP just go nowhere.
I can't help if a functional PP is not in place.
Don't know what else to say,
RICH