What was found
VTK ANNUNCIATOR, LEFT SIDE FOLLOWED BY DUAL FMC FAILURE. AIRBORNE AT 6000 FT. ANP WENT UP TO 2.85. AFTER 45 SECONDS SCREENS REAPPEARED, VTK WENT AWAY AND FMC PROMPT RETURNED. TWO SCRATCH PAD MESSAGES, CHECK POSITION FMC-GPS, CHECK POSITION -FMC -FMC. ACFT GROUNDED. FMC SYSTEM RETURNED TO NORMALL. ACCOMP FMC AND ADIRS BITE CURRENT STATUS CHECKED OK. LAST FLT LEG ON FMC ONLY LOGGED LEFT PGM FAULT AND RT POS LAT RATE. ALL TESTED NORMAL IAW FIM 34-61 / 801 - 807, AND 34-21 / 801. ACFT OK FOR SERVICE.