Upon my arrival I evaluated 1 carrier gas furnace system. I verified system safety and performance is to manufacture specifications. Flushed and treated the water removal system. Cleaned the electrical cabinet and cleaned off the flame sensor. Found the combustion control system for unit #2 to be getting dirty with soot and rust. Will send over options for repair. Also found there to be no surge protection on either system. Will send over options for installation as well. System heating properly at this time.