As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE - FLT 3076 - CREW REPORTED SMOKE IN CABIN WITH A WARNING ALARM. MAINTENANCE INSPECTED THE AIRCRAFT AND AFTER EXTENSIVE TROUBLESHOOTING THE AUXILIARY POWER UNIT WAS REMOVED AND REPLACED IAW EMB-120 MM 49-00-02. OPERATIONAL AND LEAK CHECKS WERE SATISFACTORY, AIRCRAFT WAS RELEASED FOR SERVICE. (M)