What was found
(CAN)FLAP DRIVE CAUTION LIGHT ON AFTER TAKEOFF. AIRCRAFT RETURNED. FOUND LEFT DRIVE SPLINE NOT ENGAGING IN FLAP POWER UNIT. FPU REPLACED.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(CAN)FLAP DRIVE CAUTION LIGHT ON AFTER TAKEOFF. AIRCRAFT RETURNED. FOUND LEFT DRIVE SPLINE NOT ENGAGING IN FLAP POWER UNIT. FPU REPLACED.