As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: SMELL (ROTTEN EGGS) EMANATING FROM AFT CABIN UPON LANDING. FOUND CAUSE OF SMELL IN AFT GALLEY, AFT SILL DRAIN FLOAT VALVE COMPLETELY CLOGGED. REMOVED AND REPLACED AFT SILL DRAIN FLOAT VALVE. PER AMM 38-31-06-400-802. POURED WATER DOWN DRAIN FOR OPERTIONAL CHECK OF CHECK OF VALVE, CHECKED GOOD.