As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FMC P/RST AMBER LIGHT ILLUMINATES WITHOUT ANY FMC MESSAGES. GROUNDED - YES. INSPECTED AND FOUND LEFT FMC COMPUTER INTERMITTENT FAULTY. RMVD AND INSTALLED NEW LEFT FMC COMPUTER IAW B737-900 AMM 34-61-02/401. XLOADED SW AND ADJUSTED PERFORMANCE FACTOR. PERFORMED SYS OPS TEST REF B737-900 AMM 34-61-00.