Here is the response I got from Lennox.
Dear Mr. Woolfork,
Thank you for your recent letter of April 14, 2003 regarding the Pulse inspection program. we are sorry to learn of the circumstances that made it necessary for you to write us. the Lennox Pulse Inspection Program was not a recall program due to defective heat exchangers. the consumers Products Safety Commission controls the industry and decides which products are defective and need to be recalled. Through our ongoing program of monitoring and evaluating performance data on all of our products, we were able to pinpoint the durability concern wtih the exchangers in pre-1990 Pulse furnaces and act on it through our inspection program. This program was announced on April 1, 1997 and concluded on Jyly 1, 1999.
The insepection program consisted of a pressure test of the heat exchanger and a seventeen point check of the Pulse furnace under the guidelines of the program. If the heat exchanger did not pass the necessary pressure test, a new heat exchanger was supplied under the terms of the Pulse Inspection Program.
We are sorry you were not aware of the program, however, the Pulse Inspection Program was introduced through the dealers in 1997 for customer notification and advertised nationally in the media. We sincerely regret your heat exchanger requires replacement. However the heat exchanger will be supplied under the terms of the warranty (lifetime to the original owner, twenty years to the subseqquent owner). The warranty does not include the cost of labor for replacement. If the heat exchanger is no longer available a replacement Elite G26 high-efficiency gas furnace will be provided.
To maintain the safe, efficient and reliable operation of your furnace, Lennox recommends that you have your home heating system insspected at least once a year. Best Regards, Lennox Industries Inc. G. Dennis Woods.
(Bottom line it is still going to cost $500.00)