What was found
IN CRUISE AT FL 350 OBSERVED DUAL FMC FAILURE WITH BOTH MCDUS ON MENU PAGE WITH FMC LINE BLANK, BLANKING OF NAV DISPLAYS, BOTH VTK ILUMINATED. FMC'S SELF RECOVERED AFTER APROX. 1 OR 2 MINUTES. GROUNDED - YES. UPON ARRIVAL BOTH FMCS OPERATE NORMALLY, PERFORMED SYSTEM RESET OF FMCS PRECAUTIONARY OPS CK NORMAL REF IFIM 34-61-00-810-918 SEAMC DARREN NOTIFIED.