What was found
DUAL FMC FAILURE WITH VTK DISPLAYED, ALT LIMIT BOTH FMC MENU PAGES DISPLAYED WITH OUT FMC OPTION, CWS R DISPLAYED FMC CAME BACK 30-60 SECONDS LATER SECOND WRITE UP PREVIOUS ON 6-14 . UPON LANDING IN SAN PFD SHOWED FIELD ELEVATION OF THE DEPARTURE AIRPORT GEG 2500'. GROUNDED - YES. FMC SWITCH RETURNED TO "NORMAL". DUE TO EXTENSIVE HISTORY, REPLACED R/H FMC REF B737-800 AMM 34-61-02/401. VERIFIED L/H FMC SOFTWARE ARE CORRECT AND CROSSLOADED TO R/H FMC REF AMM 34-61-00. INSTALLATION TESTS COMPLETED AND NO FAULTS FOUND.