As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING C-CHECK, THE LAVATORY SERVICE DOOR CUTOUT ON THE RIGHT SIDE OF THE FUSELAGE BELOW AND FORWARD OF THE RIGHT SIDE EMERGENCY EXIT WAS FOUND TO HAVE CORROSION ON THE SKIN DOUBLER. THE CORROSION WAS LOCATED ON THE AFT CORNER, BOTTOM EDGE OF THE LAVATORY SERVICE DOOR OPENING. APPROXIMATE LOCATION WAS X216.0 BY Y93.0. CORRODED AREA WAS CUT OUT AND AREA CHECKED USING HFEC. NO DEFECTS WERE FOUND. REPAIR WAS THEN COMPLETED USING DEHAVILLAND RD8-53-2103.