Arrived at customers house for system inspection. On arrival customer showed me to air handler unit in closet. Open air handler unit and saw bio growth on the wiring, suction line, and drain pan. Show to customer and informed him it had grown more since the last time. Customer now decided to get a UV light and an EAC filter. Cleaned inside of cabinet with antimicrobial solution. Show to customer. Customer is happy with cleaning. Installed light. Light is now on and working. Continuing my tuneup I checked under the evaporator coil and under the evaporator coil was mostly clean. Unit was producing proper delta. T. No water was seen in overflow reservoir. Float switch currently working. Next went outside to condenser. First noticed condenser was not equipped with a surge protector. Pointed out to customer and explained benefits and protection. Opened electric cabinet and all wiring was secured. Tested electric components. Contactor sending proper voltage. Capacitor within acceptable ran