All table top units are assembled in our facility in Brea, Ca. In some cases customers asked us if snap-ins on the TNP155 unit can be replaced in the field. A general answer is: NO. The TNP155 unit is UL rated and to replace the snap in connectors, you need to open high voltage portion of the table top unit. The video shows how to do it, but we still recommend that you send you unit back to Altinex for replacement in the factory.