What was found
FLASH OF RUDDER BOOST FAIL ANNUNCIATOR AND YAW DAMP KICKED OFF SHORTLY AFTER TAKEOFF. 600-800 FT. TWICE DURING DESCENT, AUTOPILOT AND YAW DAMP KICKED OFF WITH GA INDICATIONS ON PFD. 12,000-11,000FT AND 9,000-8,000FT. TWICE RUDDER BOOST FAIL AND YAW DAMP KICKED OFF AT 10,000FT AND 8,000FT. TROUBLE SHOT SYS, RETREIVED CURRENT FAULT HISTORY AND EMAILED DATA TO TECH SUPPORT. DATA REVEALED A HIGH PROBABILITY OF RUDDER SERVO FAILURE. R & R RUDDER SERVO WITH O/H UNIT IAW MM CHAP 22-13-00. OPS CHECKED GOOD.