As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GEAR RETRACTION ALL GEAR DOOR AMBER LIGHTS AND NR 2 HYD ISO VALVE CAUTION LIGHT ILLUMINATED. HYDRAULIC QUANTITY AND PRESSURE WERE NORMAL. THE GEAR DID NOT EXTEND WHEN GEAR HANDLE WAS SELECTED DOWN. CREW PERFORMED ALTERNATE EXTENSION. REPLACED NR 2 HYDRAULIC SYSTEM RESERVOIR AND ISOLATION SWITCH.