As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, THE RT MAIN LANDING GEAR DID NOT RETRACT FULLY. FLIGHT RETURNED TO STL. DURING GEAR RETRACTION TESTS ON THE GROUND FOUND BOTH MAIN LANDING GEAR RETRACT CYLINDERS WERE APPARENTLY BY-PASSING INTERNALLY. SET UP FOR REPLACEMENT OF BOTH RETRACT CYLINDERS.