As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3987, DURING ROTATION DETECTED ELECTRICAL SMOKE THEN AT 500 FEET CREW RECEIVED A LAV SMOKE WARN. ODOR LINGERED UNTIL CREW WAS BACK AT THE GATE. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED LEFT ENGINE. DEFECTS NOTED. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.