MSC furnace tuneup. Performed full detail furnace tuneup. Overall the furnace is working well. Did find that the secondary heat exchanger is dirty. This will cause airflow issues that lead to overheating, AC freezing and inefficient heating and cooling. Recommend having it cleaned. Also included options to help protect the manufacture warranty on the furnace. The manufacturer does not cover anything related to power surges or similar. They also do not cover water damage from an external source such as a flood or leaking water heater.