As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF AT THROTTLE UP FLAPS CONFIG WARNING AT 5 AND INDICATED 5. DISCONTINUED TAKEOFF. ON RETURN TO STAND CIRCUIT BREAKER C15 ON OVERHEAD PANEL TIT FLAP SLAT ELEC UNIT 1 SENSOR FOUND UNSET. C/B RESET. FLAPS CYCLED SATIS. FLAP SLAT ELECTRONIC UNIT BITE CHECK C/O IAW 27-51-00 FIG 104 SATIS ETOPS CATEGORY (B): DIVERSION OR TURNBACK.