As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, CREW RECEIVED LT AIR CONDITIONING PACK OVERHEAD MESSAGE WITH LT HX FAN FAILURE CAS MESSAGE. CREW RETURNED TO GATE. LT HX FAN DEFERRED IN ACCORDANCE WITH MEL. LATER, MAINTENANCE REPLACED THE LT HX FAN IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 21-51-23. OPERATIONAL CHECK OF SYSTEM GOOD AND AIRCRAFT APPROVED FOR RETURN TO SERVICE.