As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - DURING Q-4/CX-6 CHECK INSPECTION, FOUND 3 INCH BY 4 INCH AREA OF CORROSION (LEVEL 1) AT FITTING AT AFT LOWER CORNER OF AIR STAIR DOOR STATION 200 LONGERON 21L (PREVIOUSLY REWORKED). CORROSION TASK NR REF C45-53301. INSTALLED NEW FITTING P/N 109-7172. (M)