What was found
CREW HAD AIR RETURN DUE SMOKE IN COCKPIT, ODOR POSSIBLY OIL/HYD CMA SMOKE AND FUMES. T/S A/C SYSTEM FOUND CONDENSOR/WATER SEPARATOR BAGS BLACK COLOR WITH BAD SMELL. GASPER FAN HAD OIL ON BLADES WITH BAD SMELL. REMOVED AND REPLACED CONDENSOR/WATER SEPARATOR BAGS PER MM 21-23-51. REMOVED AND REPLACED GASPER FAN PER MM 21-23-11, OPS CHK NORMAL. RAN APU OPERATED LT AND RT PACKS, OPENED ALL GASPER AIR VENTS IN COCKPIT, NO SMOKE OR FUMES. RAN ENGINES OPERATED LT AND RT PACKS, ALL GASPER AIR VENTS OPEN IN COCKPIT NO SMOKE OR FUMES.