What was found
SMOKE NOTICED EMANATING FROM LEFT WING AREA. INSPECTED LT IB FLAP TRACK FAIRING. FOUND NO SIGNS OF HYD LEAKS. HYD QTY CHECKED OK. RAN NR 1 ENGINE AND OPERATED FLAPS. ALL OPS NORMAL NO SMOKE OR VAPORS FOUND. FLIGHT CREW REPORTED THAT IT HAD RAINED HARD IN GSO PREVIOUS 24 HRS WHILE AIRCRAFT ON GROUND AND SMOKE-VAPOR STOPPED SHORTLY BEFORE LANDING. VAPORS APPEAR TO HAVE BEEN FROM CONDENSING WATER TRAPPED IN FLAP TRACK FAIRING. DRAIN HOLES CONFIRMED CLEARED DURING POST-FLIGHT INSPECTION.