As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT LAVATORY TANK LEVEL WENT TO 100% AFTER TAKEOFF. LEFT SIDE SYSTEM SHUTDOWN FLUID IN BOWLS SPILLED OUT. AN EMERGENCY WAS DECLARED AND RETURNED TO FIELD. THE AIRCRAFT WAS GROUNDED. MAINTENANCE REPLACED LEFT WASTE LEVEL TRANSMITTER IAW AMM 33-31-11-400-801A. OPS CHECKED GOOD. REPLACED TOILET AND PERFORMED A VACCUM CHECK IAW AMM 38-31-00-790-801A. LEAK AND VACUUM TESTED GOOD.