Technician arrived to perform a $39 promo furnace tuneup on a 2009 high-efficiency carrier furnace. Technician adjusted gas pressure, checked amps, checked temperature differential, checked static pressure, changed filters, cleaned flame sensor and insured proper operation. Technician noticed that this model of carrier is notorious for having major issues in the heat exchanger and it would be in the customers best interest in replacing it. The customer is interested, and a phone call and a possible visit from Tim is scheduled for the future.