Upon arrival spoke with customer and explained what I would be doing today. Started upstairs, we found heat kit is in backwards. No disconnect for attic unit. Return duct is too small. Coil and blower are clean with no leaks. Drain line is clear at this time. Wires all tight. Went downstairs. Indoor unit is clean, no leaks on the coil and all wires are tight. Indoor units are working good. Went outside and cleaned the coils. All wires and contacters and capacitors checked out within specs. Refrigerant levels on both systems are within manufacturing specifications. Disconnects are both tight and no burnt or broken wires. Priced up to put in disconnect and flip heater kit upstairs. Fix return line upstairs and also put surge protectors on outdoor systems. Customer also asked about the heat exchanger and I called and spoke to office, he just needs to approve repairs and we will go ahead and get it on order. Customer stated once he gets on the schedule for the heat exchanger he will let