As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING FLIGHT, CREW NOTICED LOSS OF GREEN SYSTEM HYDRAULIC FLUID. FLIGHT DIVERTED TO MAIN MAINTENANCE BASE FOR INVESTIGATION. DURING INVESTIGATION, THE GREEN/YELLOW SYSTEM PTU WAS FOUND LEAKING AT THE CHECK VALVE DUE TO A DAMAGED O RING. PTU UNIT WAS REPLACED AND SYSTEM TESTS SERVICEABLE. (TC NR 20070424001)