As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CHECK-C MAINT IN THE AFT CABIN, AN OLD REPAIR INSTALLED WITH BLIND FASTENERS WAS ALSO SHOWING CORROSION ON LT STA 1287. REPAIR WAS INSTALLED EXTENDING FROM SIDEWALL INBOARD. REMOVED REPAIR. REMOVED CORROSION PER SRM 6-80-01. INSTALLED MEMBRANE DOUBLER PER SRM 53-05, FIG 96 SHEET 3.