What was found
FMC P/RST LIGHT AND VTK ON FO'S NAV DISPLAY SINGLE FMC OPERATION DISPLAYED ON FO'S FMC CDU. EXECUTED FMC FAIL QRH PROCEDURE. FMC - R POSITION DATA BLANK ON FOS PAG 3/3. AFTER 3 MINUTES FMC - R POSITION DATA RETURNED. SELECTED FMC BOTH ON L. DUAL FMC OPS RESTORED AFTER 10 MINUTES. GROUNDED - YES. C/W FIM PROCEDURE, INITIAL EVALUATION - FMC PROMPT SHOWS ON L & R MCDU MENUES. FAULT WAS INTERMITTENT & NO FURTHER ACTION REQUIRED. REF B737-800 FIM 34-61 TASK 807.