As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT ON CLIMBOUT THE LANDING GEAR WOULD NOT RETRACT. THE CREW FOLLOWED THE QUICK REFERENCE HANDBOOK AND WERE ABLE TO RETRACT THE LANDING GEAR BUT RECEIVED SEVERAL WARNING MESSAGES. THE CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED THE LANDING GEAR ELECTRONIC UNIT AND THE NOSE LANDING GEAR WEIGHT ON WHEELS PROXIMITY SWITCH. OPERATIONAL CHECKS OF THE LANDING GEAR SYSTEM WERE GOOD WITH NO FURTHER DEFECTS NOTED.