What was found
A PASSENGER SEATED IN ROW 13 AGAINST THE BULKHEAD ON THE RT SIDE NOTICED A PUFF OR CLOUD SEAM IN FRONT OF HIM. THE PASSENGER AROUND HIM NOTICED A CHEMICAL TYPE ODOR IMMEDIATELY. THE CAPTAIN, F/O AND BOTH FA NOTICED THE ODOR ALSO. THE ACFT WAS REMOVED FROM SERVICE. INSPECTED WIRING ABOVE PSU PANEL AND OVERHEAD BINS FROM 10CD TO 15CD AND BEHIND WALL PANEL 12CD & 13CD NO SMOKE OR CHEMICAL TYPE SMELLS DETECTED AT THIS TIME. ALL OPS CHECKS WERE GOOD. THE ACFT WAS RETURNED TO SERVICE.