As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COUNTERSINKS IN PANEL 522BT HAVE FRETTING. BLENDED AND CLEANED FRETTING CORROSION ON 12 COUNTERSINKS WITH SCOTCH BRITE. MAPPED PANEL 522BT FOR ENGINEERING. HFEC INSPECTION BLENDED AREAS FOR CRACKS IAW D8-400 NDTM, PART 1, 51-00-06. NO CRACKS NOTED. INSTALLED NEW PANEL 522BT FROM STOCK IAW D-8 400 AMM 57-11-01, PARAGRAPN 1-4 A-B.