As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AVIONICS BAY TCAS LOWER CHANNEL HAS SEVERAL AREAS OF CORROSION. (C-CHECK) RO 2/1/2021 REPLACED TCAS LOWER ANTENNA CHANNEL PER SRM 51-42-06-001-001-A01, SRM 51-42-21-001-001-A01 & DRAWING SH670-30023 REV G. CHECKS GOOD. SEE CONTINUATION CARD FOR DETAILS. COMPLIED WITH TASK CARD 51-900-1002-SKY.