What was found
(CAN) 1) PILOT REPORTED DISCREPANCY. YAW DAMPER DISENGAGED MESSAGE DISPLAYED, TAKEOFF REJECTED. RETURNED TO THE GATE. MAINTENANCE REPLACED INPUT/OUTPUT PROCESSOR NR 1 IAW AMM 31-41-06. YD OPERATIONAL TEST CARRIED OUT IAW AMM 22-11-36. COULD NOT FAULT. SYSTEM IS SERVICEABLE. NO FURTHUR FAULTS. IN/OP PROCESSOR REMOVED P/N C12432AB09, 2) PILOT REPORTED DISCREPANCY ON 21 OCT 2014. IN FLIGHT THE AP AND YD KICKS OFFLINE NUMEROUS TIMES LAST FEW FLIGHTS (YAW DAMPER SYSTEM). MAINTENANCE REPLACED THE FLIGHT GUIDANCE MODULE #1 AND GROUND CHECKED IT IAW AMM 22-11-01 TASK 22-11-01-720-801 AND YAW DAMPER ACTUATOR SYSTEM GROUND CHECKED IT IAW AMM 22-11-36 TASK 22-11-36-710-801. FG MODULE REMOVED.