As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YUL FLIGHT NR 2034 THE CREW REPORTED SMOKE IN THE COCKPIT AND CABIN. THEY ALSO REPORTED LOSE OF CAPTAINS MFD, PVD, AND EICAS. THE AIRCRAFT RETURNED TO YUL AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND REPLACED THE NR 1 IC-600. OPERATIONAL CHECKS WERE GOOD. THE AIRCRAFT WAS RELEASED FOR SERVICE.