What was found
DISCOVERED CORROSION AT WBL 245, 254, 336, AND 341 ON THE UPPER WING SURFACE REAR SPAR. REPAIR CONSISTED OF BLENDING OUT THE DAMAGED AREA PER SRM 57-30-1, FIGURES 1A AND 1B INSTRUCTIONS. REMOVED FASTENERS IN THE BLEND OUT AREA. INSTALLED HI-LOCKS WET WITH BMS 5-26 SEALANT IN TRANSITION FIT HOLES. CLEAN AND TREEATED ALL EXPOSED SURFACES, FILLED REMAINING VOIDS AND GAPS WITH BMS 5-95 SEALANT. REPAIR COMPLETED IAW ECO 3403. AIRCRAFT RETURNED TO SERVICE. (M)