As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TRANSPONDER SYSTEM DOES NOT FUNCTION. ALSO TRANSPONDER WILL NOT TEST. FOUND UNIT TO HAVE LOW POWER OUT. ADJUSTED CAVITY TUBE. REPLACED CAVITY TUBE (V101) P/N C2080A. REPAIRED LOW POWER OUT. TESTED UNIT AND FOUND RECEIVER WEAK. ALIGNED RECEIVER. REPLACED MIXER DIODE (CR202) P/N 007-06092-0000. REPAIRED.ADJUSTED FREQUENCY AND PULSE. BENCH CHECK GOOD.