Arrived at customers house for two unit system inspection. On arrival customer showed me to Two air handler units in attic. Started with newer system. Open cabinet doors and saw a little bit of bio growth. Pointed out to customer and suggested a UV light. Under evaporator coil was clean. Unit was producing proper delta T. No water was seen an overflow reservoir. Float switch currently working. Next went to older downstairs unit. Opened cabinet and inside. Had a lot of bio growth. All over the wiring, fan, and all over cabinet. Suggesting a fan, pulling clean, as well as a pure air UV light installation. Fan capacitor was below acceptable rating. Pointed out to customer and suggested we change. Customer agreed. Changed out capacitor and unit started up fine. Unit was producing proper delta. T. No water was seen in overflow reservoir. Float switch currently working. Next went outside to condensers. vacuumed out both condensate lines and got good vacuums from air handler systems. Opene