What was found
LEFT FMC FAILURE INCLUDING VTK ON CAPTAIN'S SIDE AND FMC BOTH BLANK. BOTH FMC'S RESTORED ON THEIR OWN BUT UNABLE TO SELECT ACTIVELY DUE TO "INVALID MOD PLAN" MESSAGE. SELECTED ROUTE 2 AND WE HAD A DUAL FMC FAILURE. NAV RESTORED ON ITS OWN. HOWEVER, WE WERE ABLE TO SELECT ACTIVE LEG. GROUNDED - YES. REF B737-900 FIM 34-61 TASK 801 AND FIM 34-61 TASK 807 ACCOMPLISHED BITE, L/H FMC LOGGED A "PGM FAULT", OPS NORMAL, NO HISTORY 60 DAYS. GROUND VERIFICATION SUCCESSFUL