As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: ALL LAVATORY STOPPED FLUSHING IN FLIGHT AND INOPERATIVE LAVATORY MESSAGE ON FLIGHT ATTENDANT PANEL. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT DFW. PERFORMED LAVATORY OPERATIONAL CHECK ON ALL THREE LAVATORY. PER AMM 38-00-00. OPS CHECK GOOD ON ALL THREE LAVATORY.