What was found
MCN - MAJOR REPAIR - DURING C16 CHECK,DISCOVERED 4 CRACKS, 1.0 INCHES IN LENGTH, ON THE NO. 1 LOWER SLAT SKIN BELOW THE INBOARD AUXILIARY TRACK FROM SS 274L TO SS 278L. MAINTENANCE CUT OUT DAMAGED AREA ON THE NO. 1 LOWER SLAT SKIN IAW BOEING 737-300 SRM 57-43-01-2R6 FIG 201. FABRICATED FILLER AND SPLICE PLATE IAW BOEING 737-300 SRM 57-43-01-2R6 FIG 201. INSTALLED FABRICATED REPAIR PARTS ON THE NO. 1 LOWER SLAT SKIN FROM SS 274L TO SS 278L IAW BOEING 737-300 SRM 51-43-01-2R6.