As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE FROM PHX TO DEN, FLIGHT CREW REPORTED A-SYSTEM HYDRAULIC QUANTITY DROPPED TO ZERO, WITH SUBSEQUENT SYSTEM FAILURE. AN EMERGENCY WAS DECLARED AND AIRCRAFT LANDED WITHOUT INCIDENT. REPLACED NR 1 ENGINE HYDRAULIC PRESSURE LINE FOUND TO BE LEAKING AND PERFORMED LEAK CHECK. NO LEAKS NOTED.