As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PRIOR TO DESCENT MASTER CAUTION HYDRAULIC A ENGINE 1 LOW PRESSURE LIGHT ILLUMINATED. HYDRAULIC A PRESSURE AT 20% PERFORMED QUICK REFERENCE HANDBOOK LOSS OF SYSTEM A CHECKLIST. EMERGENCY WAS DECLARED INTO DFW. TROUBLESHOOTING FOUND HYDRAULIC LEAK IN A ELECTRIC HYDRAULIC PUMP. REMOVED AND REPLACED A ELECTRIC HYDRAULIC PUMP ACOUSTIC FILTER PER AMM 29-11-21.