What was found
AFTER LANDING, BOTH NACELLE FLAPS WERE SLOW TO RETRACT, CAUSING DISAGREEMENT. NACELLE FLAPS EVENTUALLY RETRACTED ON THEIR OWN. REMOVED AND REPLACED LT NACELLE FLAP ACTUATOR WITH SERVICEABLE UNIT IAW MM 27-50-00. OPS CHECKS GOOD. PN: 343100-1001, SN ON: 0228, SN OFF: 0175