What was found
CREW REPORTED THAT ON FINAL APPROACH, SELECTED FLAP 9 DEGREES. RECEIVED A FLAP FAIL MESSAGE ON EICAS AND THE FLAPS REMAINED AT 0 DEGREES. RAN THROUGH FLAP FAIL CHECKLIST AND DECLARED AN EMERGENCY . LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. ACTIVATED FECU IAW AMM 27-53-00. OPS CHECKED IAW AMM 27-53-00-700-801-A. R & R THE FLAP ELECTRONIC CONTROL UNIT IAW AMM 27-53-02. OPS CHECK GOOD. NO DEFECTS NOTED. PERFORMED FLAP FAIL/FLAP LOW SPEED OPS CHECK IAW WC 27-700-28. OPS CHECK GOOD. NO DEFECTS NOTED. MEL RESTORED. THE ACFT WAS RETURNED TO SERVICE.