As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE LOSS OF LNAV & VNAV WITH FMC P/RST LIGHT & NO FMC ON EITHER CDU. NO MAP INFO ON CAPT DISPLAY. REFERRED QRH & POSITIONED FMC SWITCH TO BOTH ON RIGHT WHICH RESTORED NORMAL SINGLE FMC OPERATION. GROUNDED - YES. CYCLED BOTH FMC C/B REF B737-9 IFIM 34-61-00-810-918. LEFT FMC RESTORED. NO FAULTS NOTICED.