What was found
ALL LAVATORIES INOPERATIVE. PERFORMED TROUBLESHOOTING. R & R CONT LEVEL SENSOR IAW AMM 38-30-00-810-809 & 38-33-02-400-801. WHEN SENSOR REMOVED FOUND LAVATORY TANK PLUGGED WITH CLOTH TOWELS. REMOVED ALL BLOCKAGE FROM DRAIN VALVE. DRAINED , FILLED, CLEANED & REFILLED LAV WASTE TANK. ALL LAV FUNCTIONAL TEST OK. WASTE QTY IND STILL INDICATES FULL. CLEANED BOTH POINT LVL SENSORS IAW AMM 38-33-01-100-801. FULL LIGHT NO OUT, TANK SHOWS EMPTY, ALL LAV OPS CK OK. PERFORMED AUTO ZERO TEST IAW AMM 38-33-00-710-801. ALL LAVS NOW TEST OK. ACFT OK FOR SERVICE.