What was found
TRAILING EDGE FLAP DISAGREE EICAS MESSAGE ILLUMINATED AND FLAPS REMAINED AT 23 DEGREES DURING FINAL APPROACH. *S/D* AN INVALID FAULT INDICATION FROM THE FLAP/SLAT ELECTRONICS UNIT RESULTED IN THE ACTUATION OF THE FLAP FAILURE PROTECTION SYSTEM WHICH INHIBITS THE FLAP POWER DRIVE UNIT HYDRAULIC MOTOR OPERATION AND FLAP/SLAT MOVEMENT. THE FSEU WAS REPLACED AND TESTED AND THE FLAP/SLAT SYSTEM WAS OPS CHECKED AND VERIFIED NORMAL PER UAL MM 27-51-01.