What was found
FLT 1205, HPN-RSW, FLAPS FAIL ON FINAL APPROACH, UNABLE TO RESET PER QRH, FLAP "0" LANDING, LANDING SPEED APPROX 180 KTS. T/S PER FIM TASK 27-51-00-810-802-A, REMOVED AND REPLACED L4 FLAP ACTUATOR DUE TO BEING POPPED IAW AMM 27-51-01, ALL OPS CHECKS NORMAL AMM 27-50-00-710-801-A1500.