As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FMC P/RST BUTTON LIGHT WILL NOT RESET. GROUNDED - YES. PERFORMED FMC COMPUTER SYSTEM BITE PROCEDURE REF B737-900 FIM 34-61 TASK 801. FOUND FMC L DETECTED A FAULT FOR THE RIGHT CDU. REMOVED AND REPLACED MCDU IAW B737-900 AMM 34-61-01/401 OPS CHECK GOOD SOFTWARE PN CHECKS GOOD.