What was found
RETURN TO FIELD DUE TO A FLAP EXTENSION PROBLEM. THE TE FLAPS DISAGREE EICAS MESSAGE WAS DISPLAYED AND CAUTION LIGHT ILLUMINATED. THE TE FLAPS DISAGREE EICAS MESSAGE WAS DISPLAYED AND CAUTION LIGHT ILLUMINATED WHEN THE NR 2 FLAP/SLAT ELECTRONICS UNIT (FSEU) LOGIC DETECTED A DISCREPANCY BETWEEN THE WING AND FLAP HANDLE POSITION TRANSMITTERS. THE NOTED DISCREPANCY ALSO INHIBITED FLAP MOVEMENT. REPLACED THE NR 2 FSEU WITH NEW SERVICEABLE UNIT PER MM 27-51-01 PG.201. CYCLED FLAPS SEVERAL TIMES WITH NO DISCREPANCIES NOTED. OPS CHECKED OK.