What was found
OKC - LOWER EXTERNAL FUSELAGE SKIN IS CORRODED IN SEVERAL PLACES BETWEEN FS 590 AND 614 FROM CENTERLINE, TO APPROX 24 INCHES OUTBOARD LEFT, STATION 604-608, WL CL-10. POLISHED OUT UP TO 50 PERCENT SKIN THICKNESS, BEAD BLASTED AREA. FABRICATED AND INSTALLED EXTERNAL DOUBLER. AIRCRAFT RETURNED TO SERVICE. (M)