As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE TAXI FOR TAKEOFF, THE AIRCRAFT WAS STRUCK BY A FREE ROLLING WORK STAND ON WHEELS. THE TOWER REPORTED THAT IT LOOKED AS IF AN ENGINE STAND ROLLED INTO THE AIRCRAFT AS IT TAXIED BY. THE AIRCRAFT RETURNED TO THE GATE. MAINTENANCE INSPECTED AND REPLACED THE APU EXHAUST ASSEMBLY, IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 49-00-00. OPERATIONAL CHECKS WERE COMPLETED, AND THE AIRCRAFT WAS RETURNED TO SERVICE.