What was found
MCN - MAJOR REPAIR - DURING C-16 CHECK CORROSION WAS FOUND ON THE UPPER SURFACE OF RT AFT LAV FLOOR SUPPORT BS 992, RBL 29.5, WL 208. MAINTENANCE CLEANED CORROSION AND FOUND MATERIAL LOSS OUT OF LIMITS; REMOVED FLOOR SUPPORT BS 992, RBL 29.5. FABRICATED A NEW FLOOR SUPPORT AND INSTALLED REPAIR IAW B737-300 SRM 51-40-05, FIG 2-3 PG 4-5, AND SRM 51-40-02, PG 10-11.