UPDATE:
Dropped the pan today and traced the solenoid harness wires…found the black wire for the B shift solenoid was broken! Looking to order a new solenoid harness. Does anyone know the part number for a 2000 SR5 with the A340F tranny?
UPDATE: A furious search through Yoshis parts seems to indicate 82125-60310 is the correct part number for what I would call the solenoid harness. I’ll call Toyota in the morning to confirm the P/N. This might help someone in the future who runs into a brittle solenoid harness
Toyota confirmed the PN. Will post pictures of the old one removed…