As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DESCENDING TO FL310 HAD ADC 1 FAIL, WHICH RESULTED IN LOSS OF AIRSPEED INDICATION ON PILOT SIDE. ADC NR2 FAILED WHICH RESULTED IN LOSS OF AIRSPEED AND ALTITUDE ON PILOT AND COPILOT SIDES. AIRSPEED AND ALTITUDE INFORMATION WAS STILL AVAILABLE ON STANDBY. EMERGENCY DECLARED. DIVERTED, LANDED WITH NO INCIDENT.