As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT AFTER TAKEOFF, DURING GEAR RETRACTION, THE RIGHT MAIN LANDING GEAR DID NOT SHOW UP AND LOCKED. THE OTHER GEAR HAD GREEN INDICATIONS AND SHOWED UP AND LOCKED. THE CREW ALSO RECEIVED A LANDING GEAR LEVER DISAGREE MESSAGE. THEY FOLLOWED THE QUICK REFERENCE HANDBOOK AND LOWERED THE LANDING GEAR. ALL THREE GEAR SHOWED DOWN AND LOCKED. THE CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LANDING GEAR ELECTRONIC UNIT. EXTENSION AND RETRACTION CHECKS WERE GOOD WITH NO FURTHER DEFECTS NOTED.