As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TRANSPONER HAS NO POWER OUT. CLEANED EXCESSIVE CORROSION. REPLACED Q501/Q502 TRANSISTORS, 2 EACH INSULATORS AND 3 EACH WASHERS. ALIGNED RECEIVER TO SPECS. TRANSMIT POWER VERY WEAK. FOUND PROBLEM ON TRANSMITTER BOARD. SENT IN FOR INSPECTION AND REPAIR.