What was found
WHILE WORKING CC# 5300-01163-10, FOUND CORROSION (LEVEL 2) ON THE BS 947 FLOORBEAM, LBL 50, UPPER FLANGE SURFACE, COMMON TO THE LAV D, OB ATTACH FITTING. BLENDED CORROSION ON UPPER FLANGE UPPER SURFACE OF FLOOR BEAM BS 947.5 LBL 50 WL 208. FOUND OUT OF LIMITS. REPAIRED DAMAGE PORTION OF UPPER FLOORBEAM FLANGE BY MILLING DOWN UPPER FLANGE. INSTALLED REPAIR FILLER & LAV D AFT OTBD ATTACH FITTING, BS 947.5, LBL 50, WL208 TO REPAIR FLOORBEAM UPPER FLANGE. ALL WORK IAW SRM 53-70-51-2R-8. (1781215) AIRCRAFT WAS GROUNDED