What was found
(CAN) FLAP FAIL AT APPROXIMATELY 500 FT ABOVE ON SHORT FINAL WHEN SELECTING FINAL FLAP. GO-AROUND INITIATED, CARRIED OUT QRH PROCEDURE, CYCLED FLAPS AND ALL NORMAL. NO ADVERSE PASSENGER REACTION. NR 3 RT WING FLAP TRANSMISSION ACTUATOR REPLACED IAW AMM 27-51-01, PB401 NR 1 LT WING FLAP TRANSMISSION ACTUATOR REPLACED IAW AMM 27-51-01, PB 401.