What was found
VTK AND MAP FLAGS APPEARED ON LT ND. RAN QRH PROCEDURE. SINGLE FMC OPERATIONS RESTORED WHEN FMC SELECT SWITCH POSITIONED TO BOTH ON RT. ACFT GROUNDED. CONFIRMED NR 1 FMC, LT, INOPERATIVE. CDU SCREENS BLANK W/ L FMC OVERHEAD SW SELECTED AND FMC, INOPERATIVE, ANNUNCIATION ON FWD INSTRUMENT PANELS RESET POWER TO NR 1 FMC BY PULLING NR 1 FMC COMP C/B AND RE-SETTING SAME. FMC CDU DISPLAYS RESTORED AND "INOPERATIVE" ANNUNCIATION EXTINGUISHED. PERFORMED DFCS LRU REPLACEMENT TEST OF FMC'S IAW FIM 22-11 TASK 802, ALL OPS NORMAL. ETOPS SIGNIFICANT SYSTEM, GROUND VERIFICATION SUCCESSFUL. NO HISTORY LAST 30 DAYS. VTK AND MAP FLAGS NO LONGER APPEAR ON ND'S.