As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RUDDER BOOST OFF ANNUNCIATOR ILLUMINATED INTERMITTENTLY FOR ABOUT 3 MINUTES THEN CAME ON CONTINUOUSLY AT FL200. CIRCUIT CARDS WERE REMOVED, INSPECTED AND REINSTALLED. OPERATIONAL CHECKS WERE GOOD. CONTINUING TO MONITOR FOR FURTHER FAILURE.