As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CMH - EL - LOG 7781043 - DURING CRUISE, CREW RECEIVED A YELLOW SYSTEM LOW LEVEL MESSAGE. CREW DECLARED AN EMERGENCY. THE LANDING WAS UNEVENTFUL AND THE A/C TAXIED TO THE GATE. MX DISCOVERED THE YELLOW SYSTEM PRIORITY VALVE LEAKING. MX REPLACED THE YELLOW SYSTEM PRIORITY VALVE (3064GM) PER AMM 29-13-33-000-001. OPERATIONAL/LEAK CHECK WAS GOOD.