What was found
CREW RECEIVED FLAP DRIVE EICAS MESSAGE, EMERGENCY DECLARED. RAN FLAPS DRIVE QRH CHECKLIST. LANDED WITHOUT INCIDENT. CHECKED CMC PRESENT LEG FAULTS FOUND MESSAGE 27771 AND CMC EXISTING FAULTS. 27650 RT OTBD RVDT FAIL. R & R RT OTBD FLAP POSITION TRANSMITTER IAW AMM 27-58-01, PG BLOCK 401, REV 7702. OPS CHECK SATISFACTORY OF RVDT IAW PG BLK 27-58-01/501.