What was found
CONTROL FAULT NAC 1 BAR IN FLIGHT, WOULD NOT RESET. BELOW 180 KTS WE WERE ABLE TO RESET AND USE FLAPS NORMALLY. PERFORMED A WIPER TEST AND FOUND THE LEFT NACELLE FLAP ACTUATOR BAD. REMOVED AND REPLACED IAW AMM 27-50-09. OPS CHECK GOOD AND PERFORMED IAW RII 27-307. P/N ON 308200-1007, S/N ON 0587, S/N OFF 0464.