As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - EMERGENCY LANDING - FLT 944 - DURING APPROACH CREW REPORTED LOSING LT HYD QUANTITY AND INDICATION SHOWING 18RF. CREW DECLARED EMERGENCY INTO PHX AND LANDED WITHOUT FURTHER EVENT. MAINTENANCE FOUND THE PTU PRESSURE SWITCH LEAKING. REMOVED AND REPLACED THE PTU PRESSURE SWITCH IAW BOEING 757-200 MM 29-11-17-4. RAN NR 1 ENGINE, NO LEAKS WERE NOTED.