What was found
FL 370 ENROUTE SMELLED SMOKY SMELL, WAS STRONG IN CABIN FLIGHT ATTENDANTS CALLED & STARTED SMOKE CHECKLIST. EMERGENCY DESCENT. SMELL DISSIPATED IN LOWER ALTITUDES, NO FIRE. FLIGHT ATTENDANTS SAW SMOKE BETWEEN DOOR 3 & OVER WING EXIT. IAW AMM TASK 05-51-58-910-801C1, STARTED & OPERATED APU, BOTH ENGINES, BOTH PACKS,& ALL GALLEY & LAVATORY EQUIPMENT, IAW AMM.