What was found
A/P B DISENGAGES. WHEN ENGAGED, A/C TURNS LEFT + A/P B DISENGAGES. GROUNDED - YES. FOUND MSG 22-11505 AND 22-11190 MULTIPLE TIMES CAUSING DISCONNECTS ON B AUTOPILOT ON 4/21, 4/18 AND 4/14. VERIFIED SECURITY OF AUTOPILOT B AILERON ACTUATOR CONNECTORS. NO DEFECTS NOTED (MSG ARE FOR AIL SYNC AND AIL A/P ACT MON FCC B). VERIFIED A/P B AILERON RIG CHECKS ARE WITHIN LIMITS NO DEFECTS NOTED REF B737-9 AMM 22-11-00-820-803. PERFORMED ALL TESTS PER B737-9 IFIM 22-11-00-810-B31 (MSG 22-11505) AND 22-11-00-810-946 (MSG 22-11190). NO DEFECTS NOTED. ALL TESTS PASS. ALSO PERFORMED LAND VERIFY TEST REF AMM 22-11-00-700-801. ALL TESTS PASS. ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION SUCCESSFUL.