As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT ON CLIMB-OUT FROM PHX EQUIP COOLING EXHAUST OFF LIGHT ILLUMINATED. CREW FOLLOWED QRH PROCEDURES AND NOTIFIED MOC IN PHX. WHEN ALTERNATE SELECTED OFF REMAINED ILLUMINATED UNTIL DESCENT BACK TO PHX. REQUESTED RETURN TO PHX BY MOC. LANDED IN PHX WITHOUT FURTHER EVENT. MX REPAIRED CHAFED WIRES THAT WERE FOUND ON CONNECTOR D164, PINS 2 AND 3. SYSTEM OPERATED NORMAL ON GROUND AND DURING TAXI.