As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-15 CHECK INTERGRANULAR CORROSION WAS FOUND ON MAIN CABIN FLOORBEAM BELOW FORWARD LAVATORY AT BS 300, LBL 10. MAINTENANCE REMOVED CORRODED SECTION OF FLOORBEAM AT BS 300, LBL 10; FABRICATED 8 EACH REPAIR ANGLES; INSTALLED REPAIR PARTS IAW B737-200 SRM 53-10-09 FIG 005.