What was found
ORD - ON CLIMBOUT SMOKE AND FUMES ENTERED COCKPIT AND FIRST CLASS GALLEY AREA. ACCOMPLISHED RED BOX ITEMS AND ACRID SMELL DISSIPATED AND THEN CAME BACK. SMOKE AND FUMES WERE GONE BY THE TIME THE AIRCRAFT LANDED 15 MINUTES LATER. RETURNED ORD AND LANDED WITHOUT INCIDENT. FOUND LEFT HAND AIR CONDITIONING PACK AIR CYCLE MACHINE INTERMITTENTLY SHUTTING OFF. REPLACED LEFT HAND AIR CYCLE MACHINE. SYSTEM GROUND CHECKED NORMAL OPERATION.