As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, EXPERIENCED A' SYSTEM HYD PRESSURE LOSS. ALSO, HAD NOSE LANDING GEAR RED LIGHT ILLUMINATED WITH GEAR HANDLE IN OFF. AIRCRAFT RETURNED TO PHX AND MADE AN UNEVENTFUL LANDING. REPLACED A-SYSTEM MODULE CHECK VALVE AND RETRACTTION TESTED GEAR PER BOEING M/M.