As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT THE EXHAUST COOLING FAN "ORC" LIGHT BEGAN RAPID FLICKERING ON BOTH NORMAL AND ALTERNATE POSITION ABOVE FLIGHT LEVEL 300, PROBLEM STOPPED IN DESCENT BELOW FLIGHT LEVEL 300. MAINTENANCE REPLACED BOTH LOW FLOW SENSORS PER MM 21-58-43. EQUIPMENT COOLING TEST PASSED IAW MM 21-25-03-5.