What was found
DURING ROUTINE MAINTENANCE CHECK, FOUND CORROSION ON AFT LT LAVATORY FLOOR STRUCTURE UPPER CAP FROM BS 986 TO 1016. REMOVED DAMAGED FILLER, FABRICATED NEW FILLER IAW BOEING DRAWING 65-46812, ALODINED AND PRIMED IAW BOEING SRM 51-20-01 AND INSTALLED IAW B737 SRM 51-40-02.