As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IMMEDIATELY AFTER TAKEOFF OBSERVED ILLUMINATION OF NR 2 ISO VLV CAUTION LIGHT AND LOSS OF MOST OF THE NR 2 HYDRAULIC FLUID QUANTITY. COMPLETED QRH CHECKLIST AND RETURNED FOR LANDING. REMOVED AND REPLACED NR 2 MLG DOOR SOLENIOD SEQUENCE VALVE IAW DHC-8 MAINTENANCE MANUAL 32-10-51. BLED AND LEAK CHECKED GOOD. GEAR SWING OPS CHECKED GOOD OK FOR SERVICE.