As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK. FLIGHT CREW REPORTED FLAPS DID NOT RETRACT AFTER TAKEOFF. LT. TORQUE TUBE COUPLING AT NO. 4 FLAP TRANSMISSION WAS DISCONNECTED. RECONNECTED COUPLING PER MM 27-51-251. ADJUSTED TRAILING EDGE FLAPS PER MM 27-51-01 AND PERFORMED OPERATIONAL TEST.