As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON INITIAL TAKEOFF GEAR HANDLE WOULD NOT MOVE TO THE UP POSITION. GEAR HANDLE THEN MOVED TO THE UP POSITION WITH "LOCK OVERRIDE" BUTTON PUSHED. AIRCRAFT PERFORMED AIR TURN BACK. AIRCRAFT WAS GROUNDED BY MAINTENANCE. PSEU FAILED, PSEU REMOVED AND REPLACED. NOSE LANDING GEAR SENSORS ADJUSTED, WIRING CHECKED, OPS CHECKED GOOD.