As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON CLIMB OUT YELLOW HYDRAULIC RESERVOIR OVERHEAT WARNING OCCURRED, AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO PHX WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED HYDRAULIC CHECK VALVE 3083GM AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 29-24-21, 29-24-00 AND 29-13-00.