As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE, CORROSION WAS DISCOVERED ON REF NR 40579 L1 PAX DOOR CENTER SHAPE SILL UPPER SKIN SURFACE FRAME 17-18 STR 23L; REF NR 40579 REMOVED CORROSION AREA FOUND BEYOND LIMITS REMOVED AND REPLACED DOOR SHAPE SILL IAW SRM 53-00-29-283-001 FIG 1 AND 51-42-11.