As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AFTER TAKE-OFF DURING FLAP RETRACTION, BOTH IB AND OB FLAPS STOPPED BETWEEN FLAP POSITION 5 AND 2. AIRCRAFT DUMPED FUEL AND RETURNED TO STATION. RECTIFICATION AFTER SEVERAL SUCCESSFUL ATTEMPTS, FAULT DUPLICATED ON GROUND FAULTING THE IB FLAP POSITION INDICATOR. POSITION INDICATOR REPLACED, SYSTEM CHECK SERVICEABLE IAW MM27-52-1-11. SUBSEQUENT RIGGING OF FLAP CONTROLS WAS CARRIED OUT.