Performed furnace clean and tune; inspected the exhaust and intake PVC ensuring all connections were secured, removed and cleaned the burners along with the flame sensor, cycled the system on and checked gas pressures, as well as performed a combustion test verifying no CO in the airstream. I did a refrigerant leak search on the AC evaporator coil and did find some indicators of a possible leak. I recommend a clean and tune so we can ensure operations for this summers use. This system is currently operating normal at this time. Job complete