As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT CREW REPORTS SINGLE FMC OPERATION AND "LANDING ALT AND VERT SPEED" FLAGS ON F/O'S DU. GROUNDED - YES. ON DEFERRAL. FLT CREW REPORTS SINGLE FMC OPERATION AND "LANDING ALT AND VERT SPEED" FLAGS ON F/O'S DU. GROUNDED - YES. REMOVED AND REPLACED L FMCS COMPUTER. OPS CHECK GOOD. REF B737-800 AMM 34-61-02/401.