What was found
AFTER ENCOUNTERING TURBULENCE CABIN FILLED WITH SMOKE. LEFT RECIRC FAN ANNUNCIATED, WITH OVERBOARD EXHAUST VALVE OPEN STATUS, SMOKE DISSIPATED. FOUND LEFT RECIRC FAN INOPERATIVE. REMOVED AND REPLACED LEFT RECIRC FAN PER AMM 21-25-01 404-094, OPERATIONAL CHECKS OK.