What was found
ON TAXI OUT WITH FLAP SELECTOR 15 DEGREES, FLAPS WERE STILL AT 0 DEGREES. REMOVED AND REPLACED LEFT & RIGHT NACELLE FLAP ACTUATORS IAW MM 27-50-00. OPERATIONAL CHECK GOOD. LT P/N: 308200-1007, S/N OFF: 0242 RT, P/N: 308200-1007, S/N OFF: 0405.