As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FLAPS WOULD NOT RETRACT FROM TAKEOFF POSITION ON TAKEOFF. ACFT RETURNED TO AIRPORT. PILOTS ATTEMPTED GROUND RESET. NO RESET, FLAP WOULD NOT RETRACT. MAINTENANCE STAFF ATTEMPTED A FLAP RESET WITH MAINTENANCE BOX. NO RESET. TROUBLESHOOTING FOUND THAT 28VDC WAS AVAILABLE AT THE PDU INPUT. PDU REPLACED.