What was found
DURING CRUISE, AT APPROXIMATELY 37,000 FT CREW RECEIVED A SMOKE AFT LAV WARNING WHICH EXTINGUISHED A FEW SECONDS LATER AND THEN RETURNED A FEW SECONDS AFTERWARDS. FA PERFORMED AN INSP OF THE AFT LAV AND DID NOT NOTE ANYTHING UNUSUAL. APPROX 5 MINUTES FOLLOWING WARNING MESSAGE, SMOKE OCCURRED IN COCKPIT. CREW DONNED OXYGEN MASK, COMPLIED WIHT QRH. EMERGENCY WAS DECLARED, AC DIVERTED. SMOLE LEVEL STABILIZED, BEGAN DISIPATING ENROUTE. AC LANDED SAFELY. MAINT REMOVED AND REPLACED LT AIR CYCLE MACHINE. DURING OPS CHECK, A BELLOWS WAS FOUND LEAKING. MAONT REMOVED AND REPLACED LT BELLOWS ON ACM. OPS CHECK GOOD. AC OK FOR SERVICE. (K)