As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CMH-LAS - FLT 255 - IN CRUISE, LOST YELLOW HYDRAULIC QUANTITY. AC RETURNED TO CMH WITHOUT FURTHER PROBLEMS. MX TIGHTENED B-NUT AT YELLOW SYSTEM VALVES, HYDRAULIC PRESS MANIFOLD. SYSTEM SERVICED AND LEAK CHECKS OK. AC RETURNED TO SERVICE. (Z)