What was found
AFT WET AREA LAV G HARD POINT UNDER MOUNT CORRODED.MARKED IN RED. GROUNDED - YES. LAV MOUNT HARD POINT FOUND TO BE 50% CORRODED AND OUT OF LIMITS IAW B737-800 SRM 51-1A-1.REMOVED CORRODED HARD POINT IAW B737-800 SRM 51-40-02.LOCATED, DRILLED, AND INSTALLED NEW INTERCOSTAL HARD POINT IAW BOEING DWG 147A5680 SHEET 24 REV-DISPLACED AND REATTACHED DRAIN MAST HEATER WIRE BUNDLE IAW B737-800 WDM 30-70-11 AND BOEING SWPM 20-30-12.DRAIN MAST HEATER OPS CHECK PASSED IAW B737-800 AMM 30-71-00-720-801.