As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANTS REPORT A VERY STRONG ROTTEN EGG SMELL ON TAKEOFF AND AFTER LANDING IN THE ENTIRE CABIN. NO REPORTED SMOKE SEEN DURING INCIDENT. COMPLIED WITH JOB CARD 08L00021001 AND 08L10038003, FOUND FORWARD DOOR SILL DRAIN FLOAT VALVE CLOGGED. REMOVED AND REPLACED FORWEARD SILL DRAIN FLOAT VALVE. LEAK CHECK AND OPERTIONAL CHECK GOOD. PER AMM 38-31-06.