As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT - FLT 1243 - FLIGHT EN ROUTE PHL TO ATL WHEN 'A' SYSTEM HYDRAULIC QUANTITY INDICATED ZERO. FLIGHT DIVERTED TO CLT WHERE LANDING WAS WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED HYDRAULIC PRESSURE LINE ABOVE LEFT MAIN GEAR AND 'A' SYSTEM PRESSURE FILTERS AND BOTH CASE DRAIN FILTERS. CHECKED GOOD. (Z)