As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TROUBLESHOOTING C/H GOING OUT. UNIT WOULD NOT RECEIVE. FOUND HEAVY CORROSION AND FOUND INSULATOR BUSHINGS ON Q501 TRANSISTOR AND ON Q104 TRANSISTOR WERE BURNT. REPLACED BUSHINGS, CLEANED CORROSION AND APPLIED ALODINE. ALIGNED RECEIVER AND IF SECTIONS. ALSO TRANSMITTER WAS ALIGNED. UNIT BENCH CHECK GOOD.