What was found
AIRCRAFT IN BASE MAINTENANCE: CORROSION OF AFT CARGO DOOR THRESHOLD TORSION BOX COVER SHEET IN PREVIOUSLY BLENDED AREA AT FR56 BETWEEN STR 37R AND STR 41R, MEASURING L=0.6 IN, W=0.5 IN, D=0.035 IN. REPLACED COVER SHEET WITH NEW IAW SRM 51-72-11-911.