As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AND AFTER SELECTING NR 2 STANDBY PUMP ON, THE NR 2 HYD ISO CAUTION LIGHT ILLUMINATED. NR 2 HYDRAULIC QUANTITY DROPPED TO ABOUT 1 QT. RAN THROUGH CHECKLIST DID ALTERNATE GEAR EXTENSION AND RETURNED TO HNL. MAIN GEAR PINS INSTALLED AFTER LANDING.