What was found
WHILE THE ACFT IS IN HEAVY CHECK - FOUND LT FLOOR SILL CORRODED AT FRAME 19. REMOVED AND REPLACED LT FLOOR SILL FR19-21. REF SRM 51-40-08, RESTORED FINISH REF SRM 51-23-04, 51-23-05, 51-23-06. ACFT REMAINS IN HEAVY CHECK UNTIL COMPLETION.