As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED AFTER IT LOST HYD GREEN SYS AT APPROX ALT OF 8000'. FOUND NLG DOOR GND OPENING BYPASS VLV WAS LEAKING. REPLACED BYPASS VLV IAW AMM 32-31-15-000-001-A. AS PRECAUTIONARY, REPLACED NR 1 ENG GREEN SYS HYD PUMP IAW AMM 29-11-51-00-041-A & REPLACED ASSOCIATED FILTERS.