As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR- AIRCRAFT RETURNED TO GATE DUE TO SMOKE IN THE CABIN. MAINTENANCE FOUND TWO HOSES DISCONNECTED. REINSTALLED NUMBER TWO RECIRCULATING FAN OUTLET HOSE AND REINSTALLED HEAT EXCHANGER OUTLET HOSE AS REQUIRED. LEAK AND OPERATIONAL CHECK IAW EMB145 MM 21-51-00 GOOD. AIRCRAFT RETURNED TO SERVICE.