What was found
CREW REPORTED THE SMELL OF SMOKE IN THE CABIN ON CLIMB-OUT. CREW SELECTED RAM AIR AND SMOKE DISSIPATED. RETURNED TO LAS WHERE REPAIRS COULD BE MADE. FLIGHT ATTENDANT REPORTED SHE HEARD A GRINDING SOUND COMING FROM THE AFT PORTION OF THE CABIN. MAINTENANCE INSPECTED THE AIRCRAFT AND FOUND AIR CYCLE MACHINE (COOLING TURBINE) BEARINGS HAD FAILED. REPLACED COOLING TURBINE ASSY, PERFORMED FUNCTION TEST. ALL TESTS NORMAL, RETURNED AIRCRAFT TO SERVICE. (X)