I agree with master tech to fix the relay curcuit first, but I don't think it will fix the P0765. I'm not sure what they are calling shift solenoid A, it soes not have shift solenoids. It has a OD sol, a lockup sol., a governor pressure sol., and a governor pressure sensor. The relay supplies power for all 4 of them and the computer grounds, so for it to be a relay problem it should have a code for all 4 of them and it would not shift out of first gear because gov pres would be set a zero. I will look tomarrow and see what they are calling SSA and get back with you.