Return visit to clean indoor mini split blower wheels, after I cleaned both units I tested operation and found that everything is up and operating properly. Boiler precision tune up; clean and tune up boiler; check/verify water pressure, inspect and clean burners, test ignition components, test/adjust gas level, test safety circuit, check motors and pumps, checked all electrical components, checked heating temperatures, test combustion, and tested overall boiler operation. While performing the tuneup I found that the carbon monoxide output from the boiler was at unsafe levels, after digging into the entire system and then checking with the manufacture I do believe the heat exchanger is plugged up therefore resulting in the high carbon monoxide levels. Overall with the age of the system and the current issues at hand, I do recommend looking into replacement to avoid any further issues or high costing repair bills. Our home advisor Mike will be out tomorrow at 9am to take a look at th