As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT WITH F/D SELECTED TO FO SIDE RECEIVED SINGLE FMC OPERATION MSG FO LOST COMMAND BARS, AND A/P WENT TO CWS PITCH AND ROLL VTK WAS DISPLAYED ON FO'S DISPLAY THIS LASTED FOR A COUPLE OF MINUTES THEN SYSTEM SEEMED TO RECOVER NORMAL OPS. GROUNDED - YES. REMOVED AND INSTALLED NEW #2 FMC COMPUTER REF B737-9 AMM 34-61-02/401. XLOADE4D SW FROM LEFT TO RT SIDE. ACCOMPLISHED INSTALL TEST PER STE F OF AMM 34-61-02. SYS OPS NML.