What was found
THE CREW REPORTED THAT ON 2014/01/26 THAT THE YAW DAMPENER DISENGAGED DURING FLIGHT WHILE IN TURBULENCE, THE NR 1 FCC CARD WAS REPLACED WITH A TESTED UNIT PN 822-1019-313 & SN 1C68V. FUNCTIONAL CHECKS WERE SATISFACTORY & THE ACFT WAS RETURNED TO SERVICE. THE CREW REPORTED AGAIN THAT THE YAW DAMPENER DISENGAGED DURING FLIGHT. TROUBLESHOOTING IDENTIFIED THE NR 1 FCC CARD SN 1C68V AS DEFECTIVE & WAS REPLACED WITH A OVERHAULED UNIT. FUNCTIONAL CHECKS WERE SATISFACTORY & THE ACFT WAS RETURNED TO SERVICE.