As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATL - FLT 518 - DURING CRUISE, CREW NOTED AN 'A' SYSTEM HYDRAULIC QUANTITY INDICATION DROP. PRESSURIZED 'A' SYSTEM HYDRAULICS AND OPERATED ALL FLIGHT CONTROLS, LEADING AND TRAILING EDGE DEVICES AND GEAR HANDLE. CHECKED GEAR WELL AREAS AND AFT AIRSTAIR AREA, NO LEAKS DETECTED. SYSTEM OPERATIONAL CHECK NORMAL. (M)