As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEBRIEFED CREW AND NOTED ON APPROACH AT APPROX 4K FEET AND EQUIP COOLING POS ON OVERRIDE, THE "NO COOLING" LIGHT ILLUMINATED UNTIL ACFT BLOCKED INTO GATE. AFTER EXTENSIVE TROUBLE SHOOTING FOUND FAULTY OVERRIDE VALVE AND EQUIPMENT COOLING CARD. REPLACED COOLING CARD AND OVERRIDE VALVE. AC OK FOR SERVICE.