As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SIGNIFICANT AMT OF WATER IN AFT CABIN AFTER TAKEOFF DURING TROUBLESHOOTING FOUND PRESSURE RELEIF VALVE OF WATER HEATER LAVATORY M BROKEN OFF. REMOVED WATER HEATER LAV M REF AMM TASK 38-13-51-004-001 AND STOWED IN LAVATORY M. R/R WATER HEATER IN LAV M IAW AMM 38-13-51. OPS CHECK GOOD. REMOVED TAGS AND CLOSED CBS IAW SAME AMM REF.