What was found
**EMERGENCY DECLARED**ON FINAL APPROACH, WHEN ON G/S, SELECTED FLAPS 20 DG, TE FLAP DISAGREE EICAS MESSAGE SPEED 180KTS, ALT 3500-. PERFORMED GA, RAN THE QRH PROCEDURE. USED ALT TE SWITCH AND LANDED FLAPS 20. C/W FIM 27-51 809, BITE CHECK FSCU, NO FAULTS NOTED NO PREVIOUS FAULTS. STOWED FLAP/SLATS WITH ALTERNATE SYSTEM AND OPS CHECKED FLAPS/SLATS REF 27-51-00-862-056, CYCLED MORE THAN FOUR TIMES, UNABLE TO DUPLICATE FAULT. OK TO CONTINUE.