As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GSD 3 FAIL AMBER CAS MESSAGE CAME ON IN FLIGHT, HAD FAILURE INDICATIONS FOR ASSOCIATED SYSTEMS. CORRECTIVE ACTION: REMOVED AND REPLACED GARMIN #3 GSD-41 (DCU) IN REF TO CESSNA 680A MM 31-40-10. COMPLIED WITH #3 GSD-41 OPERATIONAL CHECK (SOFTWARE AND CONFIGURATION LOADING) IN REF TO CESSNA 680A MM 31-40-00, STEP 10.A.(1). COMPLY WITH REMAINING #3 GSD OPERATIONAL CHECKS. / GSD3