As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO ENGINE START, NR 2 DISPLAY UNIT STARTED FLASHING ON AND OFF RAPIDLY. AFTER ABOUT 20 SECONDS A STRONG ELECTRICAL BURNING ODOR WAS APPARENT IN COCKPIT. ODOR WENT AWAY WHEN EICAS SWITCH SELECTED OFF. REMOVED FAULTY DISPLAY UNIT AND INSTALLED REPAIRED UNIT IAW AMM 34-23-00 REV 11. OPS CHECKED SATISFACTORY IAW AMM 34-23-10 REV 17.