As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE FLIGHT, FMC SINGLE OPERATION, SHOWN ON BOTH FMC'S. REFERED TO QRH FOR FMC FAIL. RT FMC UNABLE TO RESTORE TO NORMAL. RT FMC INOPERATIVE. FMC SOURCE SELECT SWITCH BOTH ON "L" POSITION. ACFT GROUNDED. ACCOMPLISHED RT FMC BITE REF FIM 34-61, TASK 801. NO CURRENT FAULTS. FOUND ON RT FMC. PERFORMED RT FMC OPS TEST REF AMM 34-61-00. SYS CKS NORMAL.