What was found
(CAN) CREW ADVISED FLIGHT DISPATCH VIA THE ACARS OF A FLAP FAIL EICAS MESSAGE. DURING APPROACH, WHEN FLAPS WERE SELECTED THEY CONFIRMED A FLAP FAIL AND DECLARED AN EMERGENCY WITH ATC. QRH PROCEDURES CARRIED OUT. SF ACE 1 REPLACED IAW MM 27-53-02 FLAP OPERATION FOUND NORMAL SECOND SIGN IC AC 043021 PART OFF IS 27-50-11230, SN 0706, PN ON IS FTN 4YSH44, S/N 0697.