As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT AFTER TAKEOFF THE GEAR WOULD NOT RETRACT. THE GEAR HANDLE WORKED NORMAL. THE CREW DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE. THE ACFT LANDED WITHOUT INCIDENT. THE ACFT WAS REMOVED FROM SERVICE. R & R THE SYS NR 3 PRIORITY BALANCED RELIEF VALVE IAW AMM 29-12-05. THE OPS CHECK WAS GOOD. PERFORMED EXTENSION AND RETRACTION IAW AMM32-30-00. THE OPS CHECK WAS GOOD. THE ACFT WAS RETURNED TO SERVICE.