As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS - AIR TURNBACK - FLT 0892 - ON CLIMBOUT OF LAS EN ROUTE FOR SEA AFTER SELECTING LANDING GEAR UP THE NOSE GEAR FAILED TO RETRACT, RECYCLED THE LANDING GEAR AND NOSE REMAINED DOWN, TURNED BACK TO LAS FOR REPAIR. MAINTENANCE REMOVED AND REPLACED 2 EACH NOSE LANDING GEAR CHECK VALVES UP LINE TO NOSE LANDING GEAR UPLOCK ACTUATOR, LEAK AND OPERATIONAL CHECK WAS GOOD.