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The issue you are describing sounds just like what DW & I experienced with our 33RES. Blower would run with burner cycling on & off on high limit switch.
What was finally done, after three trips to dealer and a bit of investigation by myself.
Rigid metal elbows were installed at the furnace where ductwork comes out. Flexible ductwork had been crimped in a 90 angle that almost closed it off.
Kitchen register was reversed such that it's inlet came in from the street rather than the curb side. This allow the removal of almost 14-15 ft of flexible ducting.
Something smiliar was done for the other two registers.
I believe that the whole problem was the duct work was basically pinched off allowing furnace to get too hot.
Good luck with your fix.
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