As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SINGLE FMC OPERATION ON SCRATCH PAD. SEVERAL MINUTES LATER LNAV / VNAV DISSCONNECTED POS PAGE 3 SHOWED NO DATA FROM R-FMC. FOLLOWED QRH SELECTED FMC BOTH ON LT CONTINUED NORMALLY. NO VTX ON F/O SIDE (ONLY INFO ON R-FMC WAS POS PAGE NR 3). ACFT GROUNDED. PERFORMED FIM TK 34-61, TK 801, RT FMC OPS NORMAL. NO HISTORY. GROUND FUNCTIONAL CHECKED NORMAL. POS PAGES INDICATE NORMAL.