You asked, "How do I get someone to check for the carbon monoxide leak", this can be done by a HVAC company. They have an instrument that is very good at detecting carbon monoxide and can pinpoint the leak. There are also Carbon Monoxide detectors that can be purchased for the home that will detect the presence of Carbon Monoxide.
An intermittent problem can often be difficult to detect unless the problem is happening when someone is actually at the furnace to observe the problem at the time it occurs.
The issue of the furnace being replaced by Lennox is an question that would best be addressed by the person making that statement.
You can contact Lennox at XXX-XXX-XXXX or XXX-XXX-XXXX, for more information. Normally only the parts that need replacing will be replaced not the entire furnace. Lennox did have a recall on certain model furnaces where they replaced the heat exchange but I believe that program ended in 1999. Calling Lennox with the model number of you furnace will get you more information on their recall and information on your furnace.
If you can provide me the model number of the furnace I can provide you additional information.
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