As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON A WALKAROUND, IT WAS DISCOVERED THAT THE WING FLAPS WERE EXTENDING VERY SLOWLY WITH AN AUDIBLE GRINDING NOISE. UPON INSP, IT WAS FOUND THAT THE FLAP ACTUATOR HAD A WORN INPUT SHAFT AND FAILED COUPLER TO THE ELECTRIC MOTOR. THE ACFT WAS SNAGGED AND ACTUATOR REPLACED IMMEDIATELY.