As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 3436, DURING PRE-FLIGHT THE CREW REPORTED SMOKE IN THE COCKPIT. THE AIRCRAFT WAS EVACUATED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE RIGHT HAND GROUND COOLING FAN, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.