Arrived in Elgin for AC Tune-up, Upon our arrival we performed a 6 month checkup on one heat pump system. We cleared and treated the water removal system, washed the outdoor condenser coil with water, cleaned the electrical cabinet and treated it with electrical insecticide spray. While performing the evaluation we found the system to be low on refrigerant and dirty. After performing a leak search we found a leak on the indoor heat transfer media coil. Spoke with the customer over the phone and will be emailing over options for repairs.