As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION FOUND ON THE EXTERNAL SKIN UNDER THE TCAS ANTENNA. BLENDED SKIN UNDER LOWER TCAS ANTENNA, NDT FOUND .001' MATERIAL REMOVED, NO DAMAGE ALLOWED IN THIS AREA IAW SRM 53-21-01-101-002 A01. SUBMITTED TO STS ENGINEERING. COMPLIED WITH EA 43-2017-019 AND EC/TC/EA 43-2017-019.