As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT LAVATORY FLUID INJESTED IN THE APU DUE TO WASTE PLUMBING LINE LEAKING. TIGHTENED WASTE SYSTEM 3 WAY CONNECTOR IAW AMM 20-10-11. SERVICED AND DRAINED AFT LAVATORIES AND ACCOMPLISHED APU WASH. LEAK AND OPERATIONAL CHECK GOOD. AIRCRAFT WAS GROUNDED.