What was found
THE FIRST OFFICERS MULTI-FUNCTION CONTROL DISPLAY UNIT HAS A FAILED LINE SELECT KEY. THE LEFT HAND #2 LINE SELECT KEY IS INTERMITENT. WE TRIED A HARD PUSH AND A LONG PUSH. THE LINE SELECT KEY WOUL NOT WORK WHEN ATTEMPTING TO MAKE A CHANGE IN THE FMC NOR IN THE ACARS. GROUNDED - YES. (RESOLVED ON W/O: 1882169 TASKCARD: N/R-00001 ) REPLACED F/O FMCS CDU PER B737-800 AMM 34-61-01 PG 401, SYSTEM OPS CHECKED GOOD. VERIFIED CDU SOFTWARE CONFIGURATION PER BOEING MANUAL. ETOPS SIGNIFICANT SYSTEM GROUND VERIFICATION NORMAL. THIS CLEARS MEL 34-36L, C/N 13031537. REMOVED PLACARDS. SEAMC JARED NOTIFIED.