As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6424 - IAD-BUF - RETURNED TO IAD DUE TO THE STALL WARNING SYSTEM ACTIVATING. AIRCRAFT LANDED AT IAD WITH NO FURTHER INCIDENTS. MAINTENANCE ADJUSTED BOTH SIGNAL SUMMING UNITS. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)