What was found
IN CRUISE, 310 KNOTS @ 13000FT, AUTOPILOT FAIL EICAS WARNING MSG, FOLLOWED BY YAW DAMPER FAIL CAUTION, FOLLOWED BY RUD SYS 1-2 INOP WARNING. A/P AND YAW DAMPER MSGS CLEARED. AFTER QRH, RUD SYS 1 BECAME OPERATIONAL, RUD SYS 2 REMAINED INOP. MAINTENANCE: PERFORMED FIM TASK 27-22-00-810-804-A BLOCKS 1 AND 8. R+R RUDDER SYS #2 PRESSURE SWITCH. IAW 27-23-04. LEAK CHECK AND OPS CHECK GOOD PER AMM 27-23-00. OK FOR SERVICE AT THIS TIME.