As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENROUTE RECEIVED A SINGLE FMC OPERATION MESSAGE ON THE CDU SCRATCH PAD WITH VTK DISPLAYED ON THE F/O'S ND MAP DISPLAY. FOLLOWED THE QRH AND PLACED THE FMC SWITCH IN "BOTH ON L". CHECKED THE FMC INFO ON POS SHIFT PAGE 3/3 AND FOUND THE FMC -R IS BLANK. ACFT GROUNDED. T/S IAW FIM 34-61. COULD NOT DUPLICATE FAULT. FMC OPERATION RESTORED. NO 30 DAY HISTORY. OK FOR SERVICE.