As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURIING TAXI OUT, TE FLAP DISAGREE CAUTION AND TRAILING EDGE LIGHT UPON SELECTION OF FLAPS 5 FOR TAKEOFF. AIRCRAFT RETURNED TO BLOCKS. (BTB). TROUBLESHOOT TO MANUAL OVERRIDE BYPASS VALVE STUCK OPEN. CLEANED THE ELECTRICAL CONNECTOR AND CYCLED LEVER MULTIPLE TIMES. OPS CK GOOD IAW FIM 27-51 F/T 810. AIRCRAFT RETURNED TO SERVICE.