What was found
MCN - MAJOR REPAIR - DURING C-19 CHECK CORROSION WAS FOUND ON LOWER SURFACE UPPER AFT LEG OF FLOORBEAM UPPER CHORD AT BS 294, RBL 13, WL 208. MAINTENANCE CUT OUT DAMAGE ON FLOORBEAM UPPER CHORD AT BS 294, FROM LBL 22 TO RBL 23; FABRICATED A NEW REPLACEMENT SECTION OF UPPER CHORD, 2 EACH REPAIR ANGLES, AND A STIFFENER; INSTALLED REPAIR PARTS IAW B737-300 SRM 53-10-51 FIG 205.