As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE THE ACFT IS IN HEAVY CHECK - FOUND RT FLOOR SILL CORRODED AS/MARKED BETWEEN FRAMES 19/20. REMOVED AND REPLACED RT FLOOR SILL BETWEEN FRAMES 17-21 REF SRM 51-40-08. APPLIED SURFACE PROTECTION TO RT FLOOR SILL BETWEEN FRAMES 17-21 REF SRM 51-23-06, CPM 51-25-00. ACFT REMAINS IN HEAVY CHECK UNTIL COMPLETION.