Arrived to call for moisture leaking from underneath the furnace. Upon inspection I found the condensation drain fully clogged with debris and the evaporator drain pan over filling. I went over the repair of clearing the condensation drain with the customer and replaced the air filter with truck stock. Once finished I checked for proper temp split and static pressure. I spoke about our membership and how we flush this drain and clean the outdoor coil during our maintenances. Customer will clean the outdoor coil himself. System running upon departure.