As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN'S SIDE MCDU WENT BLANK FOR 5-10 SECONDS DURING CRUISE AT FL 360.ALL WARNING LIGHTS ON SIDES OF KEYPAD ILLUMINATED.WHEN SCREEN CAME BACK, MCDU WENT INTO BITE TEST MODE FOR ABOUT 10 SECONDS AND RETURNED TO NORMAL OPS.NO SIGN OF FMC FAILURE. GROUNDED - YES. PERFORMED B737-800 FIM 34-61 TSK 804 FMCS MCDU 1 CYCLED AND PERFORMED FMCS BITE TEST AND NO FAULTS NOTED. PERFORMED SENSORS AND INFLT FAULT TESTS. NO FAULTS NOTED. FMCS TEST NORMAL IAW FIM 34-61 TSK 801.