As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE, THE CREW RECEIVED A FEEDER TANK LOW CAS MESSAGE AND DECIDED TO RETURN TO DAY. MAINTENANCE INSPECTED AND REPLACED THE MOTIVE FLOW NON RETURN VALVE IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 28-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.