As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, CREW RECEIVED A NR 2 HYD PUMP CAUTION LIGHT WHEN THEY ATTEMPTED TO RETRACT THE GEAR. THE GEAR DID NOT RETRACT AND THE NR 2 MAIN PRESSURE WAS AT 0. THE STANDBY PRESSURE WAS GOOD. THE CREW MADE AN UNSCHEDULED LANDING AND RETURNED TO THE GATE. THE GROUND MX CREW BLED THE NR 2 HYD SYS AND FOUND AIR IN THE SYS. THEY CYCLED THE GEAR AND SERVICED THE SYS. ALL OPS AND LEAK CHECKS WERE SATISFACTORY.