What was found
LIGHT SMOKE IN CABIN ON DESCENT TO RDD. RAN MEMORY/FLOW CHECK LIST (NO OXY OR SMOKE GOGGLES), RECIRC/GASPER OFF, THEN RIGHT, THEN LEFT PAC AND STOPPED SMOKE. DID FULL RAMP CHECK OF PACKS, UNABLE TO DUPLICATE. INSPECTED BOTH PACKS AND RAM AIR VALVES FOR DISCREPANCIES. NONE FOUND. RAN PACKS WITH ENGINE AND APU BLEEDS. OPS CHECK GOOD. NO SMOKE NOTED.