furnace (Patriot 80) frustrations

I believe I have a bad heat exchanger on my Patriot 80 Plus furnace and can't find out any information for my particular model. Anyone have any ideas of where I can find out the info. The company that manufactures it is Heat Controllers out of Jackson Michigan. Thanks
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.