As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
Y SYS HYD RSUR OVHT INFLIGHT. THE FLIGHT DECLARED AN EMERGENCY AND RETURNED TO CLT WITHOUT FURTHER INCIDENT. ACCOMPLISHED TSM 29-13-00-810-819-A AND AMM 29-13-00-810-805. REPLACED TEMPERATURE TRANSMITTER AS PER AMM 29-33-11-400-003-A OPS CHECKS GOOD. SYSTEM OPERATES NORMAL. THE AIRCRAFT WAS GROUNDED.