As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BEFORE TAKE-OFF, ELECTRICAL BURNING ODOR AND SMOKE IN COCKPIT APPEARED. VERIFIED PROBLEM, FOUND WATER INTRUSION IN LEFT FLIGHT DIRECTOR MODE ANNUNCIATOR ASSEMBLY. REMOVED AND REPLACED CAPTAIN'S FLIGHT DIRECTOR MODE ANNUNCIATOR. OPS CHECKED GOOD IAW DC-9 MM 34-25-00.