As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FMC FAIL, NO FMC DATA ON F/O NAVIGATION DISPLAY MAP MSG LIGHT ILLUMINATED AND SINGLE FMC OPERATION SCRATCHPAD MESSAGE SHOWN. FMC SOURCE SELECT SWITCH, BOTH ON LEFT, CONTINUED WITH SINGLE FMC OPERATION. GROUNDED - YES. VERIFIED - PERFORMED B737-800 FIM 34-61 TASK 836. 1 EA C/B CYCLED - FMC RETURNED TO NORMAL. INITIAL EVALUATION PER FIM GOOD. GROUND VERIFICATION TEST GOOD.