As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN REPORTED ATC TRANSPONDER OUT OFF SERVICE. WITH ATC TRANSPONDER FAILURE WAS REQUESTD TO FAA ATCA TO OPERATE IAW MEL34-22 (AUTHORIZATION NR ZFWZM04052003). DURING OVERNIGHT SERVICE BOTH ATC TRANSPONDERS, LOWER ANTENNA AND TRANSFERENCE RELAY WERE REPLACED IAW MM, TESTS CORRECT.