As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAINS' FMC FAILED ABOUT 2:20 INTO FLIGHT. RAN QRH AND RE-ESTABLISHED DUAL FMC OPERATION. FAILED AGAIN ABOUT 25 MINUTES LATER. CONTINUED WITH SINGLE FMC OPERATION. GROUNDED-YES. R & R FMC1, REF B737-900 AMM 34-61-02. OPERATIONS CHECK GOOD. SOFTWARES MATCH WITH FMC 2. NO DEFECTS NOTED AT THIS TIME. OP PROGRAM 556909-001 VERIFIED AND GOOD.