As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-21 CHECK CORROSION WAS FOUND ON UPPER AND LOWER SURFACE OF FLOORBEAM UPPER AFT LEG AT BS 947 FROM RBL 5 TO LBL 53. MAINTENANCE CUT OUT DAMAGED FLOORBEAM UPPER AFT LEG AT BS 947 FROM RBL 5 TO LBL 53; FABRICATED A FILLER AND 2 EACH REPAIR ANGLES; INSTALLED REPAIR PARTS IAW B737-200 SRM 53-10-09 PG 1-5 FIG 7.