As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING COMPLIANCE OF AD 99-08-10 FOUND EVIDENCE OF CORROSION ON UPPER SIDE, FORWARD LAVATORY, SERVICE DRAIN BOX. AFTER FURTHER INVESTIGATION AND REMOVING THE DRAIN VALVE BOX DOUBLER. IT WAS FOUND THAT THE DRAIN BOX DOUBLER ITSELF WAS CORRODED. REMOVED FORWARD LAVATORY DRAIN BOX AND REPLACED WITH NEW IAW SRM 51-20-02 FIG 2 AND BOEING DWG NR 65B07388. (M)