What was found
ALL TOILETS STOPPED WORKING AT SAME TIME IN FLIGHT FOUND VACUUM WASTE CONTROL C.B. POPPED ON P 91 PANEL,RESET AND POPPED AGAIN. DISCONNECTED LOGIC CONTROL MODULE AND BREAKER STAYS RESET. WITH J4 CANNON PLUG OF LCM CONNECTED,VACUUM WASTE CNTRL C/B ON P91 PANEL TRIPS. SLAVED IN GOOD VACUUM WASTE MODULE, NO HELP. REINSTALLED ORIGINAL MODULE. PULLED CONNECTOR AT EACH TOILET ASSY TO DETERMINE LAV "A" WAS POPPING THE BREAKER. NEED TO REPLACE LAV "A" TOILET ASSY. PULLED BREAKER ON FOR THE VACUUM WASTE MODULE. REMOVED TOILET ASSY. REF AMM 38-32-01. REPLACED INTEGRATED SYSTEM CONTROLLER REF MM 38-32-01. ALL TOILETS CHECK GOOD. BREAKER STAYS IN.