As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT DURING CRUISE EQUIPMENT COOLING EXHAUST OFF LIGHT ILLUMINATED. CREW PERFORMED QRH AND THE ALTERNATE COOLING OFF LIGHT ILLUMINATED. CREW RETURNED TO PHX AND LANDED WITHOUT FURTHER EVENT. MAINTENANCE REMOVED AND REPLACED THE M00100 AIR FLOW DETECT SENSOR. OPERATIONAL CHECKS WERE GOOD. NO FAULTS WERE NOTED.