What was found
DURING HEAVY CHECK, INSPECTIONS OF THE INTERNAL FUSELAGE FLOOR STRUCTURE AT CF ILL, FR 86-FR87 L/H, STR 17 LT, CORROSIN FOUND REAR PAX DOOR LOWER SILL BEAM. CORROSION REMOVED BY BLENDING, IAW SRM 51-10-03, MAX MATR REMOVED, .006, 10 MAG C/OUT, NO FAULT FOUND. FOUND TO BE WITH IN LIMITS IAW SRM 53-23-11, AD03, SEE AWS FOR WORK PERFORMED. PERMANENT REPAIR WITH FIRST INSPECTION 6306 FC, INTERVAL 6306. NRC#4502601-2000-0257. REV 68 .