As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A LEFT HAND AIRCONDITIONING PACK OVERHEAT WARNING MESSAGE ILLUMINATED, DURING TAXI FOR TAKEOFF. THE AIRCRAFT RETURNED TO THE GATE. MAINTENANCE INSPECTED AND REPLACED THE LEFT HAND GROUND COOLING FAN IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 21-51-23. FUNCTIONAL CHECKS WERE COMPLETED AND THE AIRCRAFT WAS RETURNED TO SERVICE.