Completed with heat 1 on a 2005 carrier gas up flow in closet 5 ton, unit poorly hearing due to age and failing components, found blower motor with oil stains shaking, inducer motor showing wear along with flame sensor, ignitor, gas valve opened untill second attempt and heat exchanger has corrosion and rust. Giving customer the option to do all preventative repairs, minimum repairs, furnace upgrade or complete. Customer only approved to replace flame sensor at time since she needs to talk to son about replacing unit, money spent today will go towards a new unit if is in less then 4 months.