As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TRANSPONDER FAILURE: IDENT PULSE PRESENT AND REPLY LAMP LIT WHEN UNIT HOT. (NOT COMMANDED) FOUND Q22 AND ASSORTED CIRCUIT VERY TEMPERATURE SENSITIVE. REPLACED COMPONENTS AND FOUND Q22 NOT STANDARD PART. PART INSTALLED AN ECG TPE 123. PART REPLACED WITH ARC PART RENDERING UNIT SERVICEABLE.