As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GNDED. ODOR DETECTED IN FWD LAVATORY DURING DESCENT THROUGH 10,000. ELEC OR OZONE TYPE SMELL. ACCOMPLISHED JC 26L00021001 TROUBLESHOOT CABIN AIR QUALITY. ISOLATED SOURCE OF ODOR TO FWD LAVATORY WATER HEATER. REPLACED FWD LAVATORY WATER HEATER IAW AMM 38-12-16-0401 & ACCOMPLISHED A SATISFACTORY OPERATIONAL & LEAK CHECK WITH NO FURTHER DISCREPANCIES NOTED. ACFT RETURNED TO SERVICE.