As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FROM LP503550 ITEM #1 HYD G RSVR LO LVL IN FLIGHT. G HYD LVL OBSERVED TO BE AT TOP OF AMBER CAUTION ZONE. REMOVED AND REPLACED THE ENG 1 ENG-PUMP SWITCH IAW AMM 29-11-17-000/400-802-A. OPS CHECK, LEAK CHECK GOOD. NO FURTHER DEFECTS NOTED. REF LP503550-3 FOR HYD SERVICE.