What was found
RESET SMOKE DETECTORS ON GND IN DTW, RESET GOOD. ABOUT A HALF HOUR FROM PHX, GOT A FIRE BELL & LAVATORY SMOKE ECAM THAT LASTED FOR 5 OR 6 SECONDS THEN CLEARED ITSELF. NO SMOKE IN ANY LAVATORY`S, DID NOT REPEAT. PERFORMED TROUBLESHOOTING IAW 26-17-00-810-801A, NO FAULTS NOTED. PERFORMED OPERATIONAL CHECK OF ALL LAVATORY`S IAW AMM 26-17-00-710-001-A, NO FAULTS NOTED.