As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTURE, THE CREW RECEIVED A LEFT HAND ENGINE CHIP DETECTOR LIGHT. MAINTENANCE CONTROL AND DISPATCH HAD FLIGHT 4012 RETURN TO DAY FOR MAINTENANCE. MAINTENANCE INSPECTED AND FOUND FUSS ON THE CHIP DETECTOR. MAINTENANCE CLEANED THE CHIP DETECTOR IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 79-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.