As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW RECEIVED ATT: CAGE MESSAGE ON ISIS IN FLIGHT. IN STABLE FLIGHT THE CREW TRIED TO RESET PER QRH AND FAILED TO GET ATT 10'S FLAG AND RETURNED TO FIELD. MAINTENANCE TROUBLESHOT THE FAULT PER FIM 34-01-00-810-809-A AND FOUND IT TO BE A TRANSITORY CONDITION OF THE ISIS. ISIS FUNCTION TESTED GOOD IAW MM 34-01-01.