JD 624G wont go fowrards or backwards, major gremlin

Greetings everyone. First time posting on your forum but have visited many times through the power of google. But this machine im working on is majorly F-d up and my boss refuses to call John Deere so. Its a 624G last Thursday machine wouldnt go into gear F or R so the day laborers put a gear selctor switch in, ran great till they shut it off. Friday I go there right from home armed only with a test light. Poke around and wasnt getting power out of parking break switch, swapped switches from sister machine, worked great. Shut it off same thing. So yesterday swap the TCU, nothing. All the fuses are good, swapped relays. Ohmed out the solenoids, nothing. Clutch disconnect works, no power when engaged, power when disengaged. The parking break does dissengage freely as well. What I did find though is the tranny temp sensor is bad but jumped it out with my power probe and a 9v, nothing. Getting power to the TCU but nothing out of it for the drive solenoids. When I power the soenoids works. I am just racking my brain and wondering if I over looked anything or anyone have any experience with these machines. Thanks in advance, Jon

JD 624G wont go fowrards or backwards, major gremlin