As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN`S FMC CDU DIM MODE FOR ACARS AND OTHER ALERTS INOPERATIVE. ACFT GROUNDED. PERFORMED TEST OF CAPTAIN`S MCDU IAW MM 34-6101-400-802 PARA D.(2) MCDU TESTS NORMAL. BRIGHTNESS AND DIM FUNCTIONS TEST NORMAL FOR BOTH DISPLAY AND KEY PAD. HAD DISPATCH SEND MESSAGE TO AIRCRAFT, MESSAGE RECEIVED NORMALLY, MESSAGE ACKNOWLEDGED BY DISPATCH MCDU OPERATES NORMALLY.