As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - DURING A/C TURNAROUND, FOUND 4 INCH BY 5.5 INCH CORROSION AREA BETWEEN INTERNAL DOUBLER AND SKIN AT STATION 218 BETWEEN LONGERONS 21L AND 22L. CUTOUT CORRODED SKIN AREA, INSTALLED FILLER AND DOUBLER CLASS II TEMPORARY PER SRM 53-04 FIG 12B AND TYPE REPAIR 53-04-01A. (M)