As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - CREW REPORTED AFTER TAKEOFF, EQUIPMENT COOLING OVERHEAT LIGHT ILLUMINATED AND HAD LOUD POP/BANG. EMERGENCY DECLARED FLIGHT RETURNED MIA LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED FORWARD EQUIPMENT NUMBER ONE FAN. SYSTEM GROUND CHECK NORMAL OPERATION.