As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE - FLIGHT 2115 THE CREW REPORTED SMOKE IN CABIN AND FLIGHT DECK FROM PACKS. THE AIRCRAFT RETURNED TO LGA AND MAINTENANCE PLACED PACK NR 1 ON MEL. THE AIRCRAFT HEATING AND AIR CONDITIONING SYSTEM WAS TESTED THE NEXT DAY AND FOUND TO BE OPERATING CORRECTLY, AND THE SOURCE OF THE SMOKE WAS THE NR 1 ENGINE. MAINTENANCE REPLACED THE NR 1 ENGINE AND THE OPERATIONAL CHECKS WERE GOOD WITH NO SMOKE OR FUMES DETECTED.