As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHERE THE LOWER TCAS OMNI DIRECTIONAL ANTENNA MOUNTS IT HAS LIGHT CORROSION ON SKIN. R & R EXTERNAL TCAS DOUBLER IAW SRM 51-40-02 AND SB 767-34-0087, REV 4, DATED AUG 5 1993. PN 141T0112U31, PARTNAME: ANTENNA DOUBLE CORRODED LEVEL 2 FS/BS 399 STR/WS 538. ACFT WAS GROUNDED.