As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AT FL 370, RECEIVED EICAS MESSAGE "EQUIPMENT OVERHEAT" MESSAGE. DECENDED TO FL 310. DURING THIS DECENT, RECEIVED "CABIN ALT" MESSAGE. DECLARED EMERGENCY AND DIVERTED. MAINTENANACE PERSONNEL PLACED THE EQUIPMENT COOLING SYSTEM ON MEL AND ACCOMPLISHED A TEST OF THE CABIN ALTITUDE WARNING SYSTEM. NO DEFECT NOTED AND THE AIRCRAFT WAS RELEASED.