As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR DID NOT RETRACT AFTER TAKEOFF. PARKING BRAKE SHUT-OFF VALVE MESSAGE AND ANTI-SKID IB MESSAGE. COMPLIED WITH QRH, RETURNED TO COS WITH UNEVENTFUL LANDING. REMOVED AND REPLACED GEAR SELECTOR HANDLE IAW MM FUNCTION AND OPS CHECK GOOD.