As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RED CAS HYD O' TEMP B MESSAGE CAME ON IN FLIGHT CORRECTIVE ACTION: REMOVED FAULTY HYDRAULIC TEMPERATURE TRANSDUCER ON SYSTEM B RESERVOIR AND REPLACED WITH A CUSTOMER SUPPLIED NEW UNIT. OPS CHECKS AND LEAK CHECKS ARE GOOD AT THIS TIME. ALL WORK DONE IN REFERENCE TO CE-700 AMM 29-30-10.