As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, THE CREW DISCOVERED THAT THE GEAR WOULD NOT RETRACT AND RETURNED TO PIT. MAINTENANCE INSPECTED AND FOUND THE RIGHT HAND MAIN LANDING GEAR PROXIMITY SENSOR OUT OF ALIGNMENT. MAINTENANCE ADJUSTED THE SENSOR IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 32-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.