As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A HEAVY MAINTENANCE CHECK, THE AFT LEFT LAVATORY OXYGEN MASKS DID NOT DROP DURING TEST. TS AND CONNECTED WIRES FOR AFT LEFT LAV E OXYGEN CONTROL WIRING AT S3 824 TERMINAL STRIP IAW DC10 MM 223000 AND DC10 WD 352201. OPERATIONALLY CHECKS GOOD IAW DC10 MM 352101.