As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: MODE CONTROL PANEL WENT BLANK IN FLIGHT. CAPTAIN'S FLIGHT DIRECT WORKED BUT THERE IS NO WAY TO CONFIRM ALTITUDE, HEADING, COURSE OR VERTICAL SPEED; AIRCRAFT DIVERTED TO AND SAFELY AT IAD. TROUBLESHOT PER FIM 22-11-00-810-817, REMOVE AND REPLACE MODE CONTROL PANEL. INSTALLATION TEST AND IBIT TEST GOOD. PER 22-11-34.