The service man who cleans my Lennox G26 showed me that there is water dripping at the sealing joint of the heat exchanger box and the blower (not the circulation blower - the one on the heat exchanger). There were other spots along the plate below the blower that the metal was discoloured has if water had been there at one time. The service man recommended that I call Lennox to see if there are any upgrades to the G26 furance that might be free or reduced cost.
Before I call the Lennox service I would like to ask if anyone has had this water problem. It's not a lot of water, just a drip now & then, and appears to be only during the heating season.