As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6455 - IAD-PHL - DURING APPROACH, THE STALL WARNING HORN AND STICK SHAKER ACTIVATED. AIRCRAFT LANDED AT PHL WITH NO FURTHER INCIDENTS. AIRCRAFT WAS THEN FERRIED TO IAD WHERE IT LANDED WITH NO INCIDENTS. MAINTENANCE REPLACED THE RIGHT SIGNAL SUMMING UNIT. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)