What was found
INSIDE AIRCRAFT CABIN LT SIDE BS 409+128 - 428 (APPROX) PRESSURE FLOOR SILL SHOWS SIGN OF CORROSION IN MULTIPLE AREAS. REMOVED CORROSION INSIDE THE AIRCRAFT CABIN LT SIDE BS 409+128 - 428 (APPROX) PRESSURE FLOOR SILL IAW SRM 51-21-06. MEASURED AREA ON PRESSURE FLOOR SILL ORIGINAL THICKNESS IS 0.080" AND 0.055" MINIMUM REMAINING ON AREA IS 0.067" & 0.051" AREA FOUND TO BE ALLOWABLE LIMITS IAW REO 601R-53-41-3402 REV--. RESTORED SURFACE FINISH ON FLOOR SILL IAW REO 601R-53-41-3402 REV- AND SRM 51-21-16. CIC TO BE APPLIED ON WORK CARD 2530/ CP 31823245. AIRCRAFT WEIGHT CHANGE NEGLIGIBLE IAW REO 601R-53-41-3402, REV--. THRESHOLD INSPECTION DUE BEFORE OR AT 48015 FLIGHT CYCLES.