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 LOWER SILL LOCATED FR66 TO FR68 AT LEVEL STR 23L SIDE AT AFT GALLEY AREA; R & R LOWER SILL LOCATED FR66 TO FR68 AT STR 23L SIDE AT AFT GALLEY AREA IAW SRM 51-72-11 AND DRAWING D53480505. THIS PART IS CONSIDERED AT PSE AND FCS IAW SRM 51-11-12 FIG 020. WORK COMPLETED ON W/O 2019-310/1 N/R 2019-302844.