As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EQUIP COOLING OVERHEAT ON DEPARTURE. STBY UNABLE TO COOL EQUIP. OVERHEAT LIGHT RETURND AFTER OVERIDE IN FLIGHT FOLLOWED FM NON-NORMALS 2.20.43 TO OVERRIDE FOR 30 MIN UTES, BACK TO AUTO OVERHEAT LIGHT FLICKERED BUT EXTINGUISHED. CREW OPTED TO DIVERT INTO DUB. ACCOMPLISHED TASK 21-58-00-705-120-0 06 - OPS TEST - EQUIPMENT COOLING SYSTEM. INSPECTED E&E COMPARTMENT NO ODOR NOTED. AIRCRAFT DEPARTED WITH VERY WARM CABIN FRA TEMP WAS 90'S AT DEPARTURE TIME.