As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 278 - SFO-FWA - DUIRNG CRUISE HAD TO KEEP AUTO PILOT TURN KNOB ALL THE WAY TO THE LEFT TO HAVE AIRPLANE FLY STRAIGHT AND LEVEL. FLIGHT CONTINUED AND AN UNEVENTFUL LANDING WAS MADE. MAINTENANCE PERFORMED AUTOPILOT SYSTEM OPS CHECKS ON GROUND. COULD NOT DUPLICATE ON GROUND. AIRCRAFT RETURNED TO SERVICE. (M)