Performed heater tune-up on a Goodman gas furnace system. Checked the electrical, mechanical and performance systems of the unit. Cleared, cleaned, flushed and treated the drain line and cleaned the exterior of the air handler. I did find there is flexible gas line going into the furnace. I placed some insulation on the gas line to help prevent any rub outs. I also found the outdoor condenser breaker is rated for a 45 amp breaker and is currently oversized with a 50 amp breaker. No other issues were found. The system is operational at this time.