As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2994 - AFTER TRANSFERRING BLEEDS TO THE APU DURING BOARDING PROCESS FO NOTICED SMOKE IN COCKPIT AND CABIN. AIRCRAFT DEPLANED AND SHUTDOWN, NO FIRE OR SMOKE FOUND BY FIRE PERSONNEL. NO DEFECTS FOUND BY CONTRACT MAINTENANCE, AIRCRAFT FERRIED TO DTW. MAINTENANCE INSPECTED AIRCRAFT AND PERFORMED OPERATIONAL CHECKS OF APU AND BLEED SYSTEM WITH NO DEFECTS FOUND.