As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD-TYS - FLT NR 6160 - DURING CLIMB-OUT, RETURNED TO IAD DUE TO THERE BEING A BURNING SMELL IN THE CABIN. AIRCRAFT LANDED AT IAD WITH NO FURTHER INCIDENTS. MAINTENANCE REPLACED THE AUTO-PILOT CONTROLLER. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)