What was found
FLIGHT 7740 ORD-DFW - ON FINAL APPROACH INTO DFW, THE FLAPS FAILED AT THE SLAT 3/ FLAP 0 POSITION. FLAP FAIL MESSAGE APPEARED ON EICAS. THE APPROACH WAS ABORTED WHILE THE QRH WAS WORKED. AN EMERGENCY WAS DECLARED AND THE AIRCRAFT LANDED IN DFW UNEVENTFULLY. THE AIRCRAFT WAS FERRIED TO IND FOR MAINTENANCE. MAINTENANCE TROUBLESHOT THE FLAP SYSTEM AND FOUND THE RIGHTHAND INBOARD FLAP ANGLE GEARBOX TO BE BINDING. REMOVED AND REPLACED RIGHTHAND INBOARD FLAP ANGLE GEARBOX IAW EMB 170 AMM 27-50-00. OPS CHECK GOOD.