As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INVESTIGATED PILOT REPORT OF INTERMITTENT (RUDDER BOOST FAIL) ANNUNCIATOR LIGHT DURING TAKEOFF, CRUISE, AND CLIMB SEGMENTS. FOUND RUDDER SERVO WOULD SPIKE HIGH VOLTAGE BUT YAW DAMPER WOULD STAY ENGAGED. REPLACED RUDDER BOOST SERVO W/OVERHAULED REPLACEMENT UNIT, SYSTEM FUNCTIONAL TESTS SATISFACTORY. (K)