What was found
AIRCRAFT IN BASE MAINTENANCE: CORROSION OF AFT CARGO DOOR THRESHOLD TORSION BOX COVER SHEET IN PREVIOUSLY BLENDED AREA AT FR56+16" AND STR 37R, MEASURING L=0.8 IN, W=0.8 IN, D=0.018 IN. REPLACED COVER SHEET WITH NEW IAW SRM 51-72-11-911.