As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAXIING FROM RAMP, RETURNED TO PARKING RAMP WITH EICAS YELLOW CAUTION MESSAGE FOR THE NR 5 COCKPIT DISPLAY UNIT. MESSAGE CREATED IN WRAP AROUND CIRCUIT BETWEEN THE NR 1 AND NR 5 DISPLAY UNITS. CYCLED AVIONICS MASTER SWITCH OFF THEN BACK ON. SYSTEM OPERATION WAS NORMAL. SYSTEM SERVICEABLE.