As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF AND BECOMING AIRBORNE THE STICK SHAKER WENT OFF CONTINUOUSLY WITH AIRSPEED INDICATION IN RED. CREW LEVELED OFF FROM 5000’ TO 2200’ AND DECLARED AN EMERGENCY. THE ACFT DIVERTED AND LANDED WITHOUT INCIDENT. MX FOUND THE ANGLE OF ATTACK VANE FROZEN INTO POSITION. THE AOA VANE WAS DEICED. OPS CHECK OF THE AOA SYSTEM AND HEATER WAS GOOD. ACFT WAS RETURNED TO SERVICE.