As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK DUE TO A GREEN SYSTEM HYDRAULIC SYSTEM COMPLETE LOSS OF FLUID. PUMPS & FILTERS INSPECTED IAW MM 29-00-00-301. R & R THE FILTERS 291048. 291049, AND 291002. NO DISCREPANCIES FOUND. REMOVED & REPLACED THE HYD CASE DRAIN FILTERS ON LEFT AND RIGHT ENGINES IAW MM 29-11-36.