As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACRID FUMES SMELL IN COCKPIT AFTER TAKEOFF, ALSO SMELL IN CABIN OF ACFT. THE FLIGHT DECLARED AN EMER & RETURNED TO FIELD WITHOUT FURTHER INCIDENT. ACFT WAS REMOVED FROM SERVICE. R & R THE FWD LAVATORY WATER HEATER IAW AMM 38-12-16. OPERATIONALLY CHECKED OK.