As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) INCIDENT DETAILS:PAN PAN DECLARED AT 40W DUE TO LOSS OF 2 FMCS. AUTOPILOT SERVICEABLE.REBOOTED SYSTEM,NOW OK,CANX PAN PAN WITH ATC.CARRYING ON RESOLUTION ON THE MAT FOUND MSG 31-83172 NOT ACTIVE. GRND TEST THROUGH MAT TEST PASS. NO FAULT HISTORY.