As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE, (NR 2019-313370) CORROSION LOWER SILL BTW FR66 - FR68 AT LEVEL STR23L AT AFT GALLEY AREA; REMOVED AND REPLACED LOWER SILL LOCATED BTW FR66 - FR68 AT LEVEL STR 23L AT AFT GALLEY AREA IAW A320 SRM 51-72-11 AND DRAWING D53480505. TOOL USED CALIPER P/N 500-197-30 S/N A18109017 DUE DATE APR -10-2020 ACCOMPLISHED. THIS IS CLASSIFIED AS MAJOR.