As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE: C&SI, ON REMOVAL OF WINDOW FRAME TO FACILITATE BS 870 FITTING REPLACEMENT CORROSION FOUND ON FLANGE OF WINDOW FRAMES, FRAME AT BS 880 AT LWR AFT CENTER. CORROSION BLENDED OUT IAW SRM 51-10-6 & AREA OF DAMAGE FOUND OUTSIDE LIMITS IAW SRM 56-20-1. FABRICATED AND INSTALLED REPAIR DOUBLER IAW SRM 56-20-03 FIG 1.