As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FMC FAULT. "CHECK FMC TO FMC" MESSAGE. RIGHT FMC WOULD NOT UPDATE POSITION. LENGTH OF DIVERSION 28 MINUTES. DUPLICATED FAULT RT FMC COMP WOULD NOT ACCEPT ANY S/W LOADS. REPLACED RT FMC REF MM 34 61 02, OPS CHECK NORMAL AND ALL S/W CHECK OK.