As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ISFD AIRSPEED UNRELIABLE. AIRSPEED WENT FROM 300KTS TO 50 KTS, RETURNED TO NORMAL LATE IN APPROACH. AIRSPEED UNRELIABLE AT 17000 AND CONTINUED UNTIL 2500. EMERGENCY DECLARED AND FLIGHT LANDED WITHOUT FURTHER INCIDENT. THE AIRCRAFT WAS GROUNDED. MAINTENANCE FOUND AUXILLARY PITOT HEAD INOPERATIVE AND REPLACED AUXILLARY PITOT TUBE IAW AMM 34-11-01, AND PERFORMED SATISFACTORY OPERATIONAL CHECK.