As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VHF TRANSCEIVER INOPERATIVE - DOES NOT ILLUMINATE CONTROL DISPLAY. PERFORMED PRELIMINARY INSPECTION. FOUND ALL POWER SUPPLY VOLTAGES BAD. TROUBLESHOT UNIT AND FOUND LIFTING DIODE CR107 WOULD GET POWER SUPPLY VOLTAGES TO COME UP. ALSO FOUND WRONG DIODE INSTALLED FOR CR107. REPLACED DIODE CR107. DID NOT CURE PROBLEM. ALSO REPLACED TRANSISTORS Q106 AND Q107. NO HELP.