Share 'Prefamac Molding Machine'

I recently bought used 60lb molding machine made by Prefamac. Everything seems to work except the most important part.  It doesn't hold temperature.  I have emailed back and for with Prefamac and it seems they are out of ideas because they quit replying to my emails.  Does anyone know of a place in the states that will repair this machine or I can call for help?