Performed AC diagnostic on two system comfort maker 18 years old. Upon diagnostic From the condenser line sets were freezing up due to no fan returning on and determine that circuit boards have been blown on upstairs and downstairs. Customer had Electrical company out that swapped out motors for free and thermostats with nest. During my diagnostic I found that the circuitboard was not getting supplied 120 V to power in cooling mode on both boards. Also jumped ECM motor out on door switch and motor turned on for upstairs system. Circuit board was hot to touch on both systems. Recommended swapping both circuit boards out on the customer waived repairs