As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE OF THE FLIGHT FROM ORD TO JAX, THE NR 1 HYDRAULIC SYSTEM INDICATED AN OVERHEAT. THE CREW FOLLOWED THE QRH PROCEDURES, SHUT DOWN THE NR 1 ENGINE AND DIVERTED TO IND WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE PERSONNEL REMOVED AND REPLACED THE HYDRAULIC HEAT EXCHANGER AND HEAT EXCHANGER POWER RELAY. A MAINTENANCE ACCEPTANCE FLIGHT WAS SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE. RELAY P/N M83536-6-025M.