1 system CCM- Checked heating operations of 2020 Trane furnace in attic. Replaced customer provided 16x25x4 filter, Checked capacitor outputs and amp drawls, Inspected heat exchangers, Checked delta T, triggered safety switches, Cleaned flame sensor, Cleaned burners, and cleared drain line. System is operating properly at this time. Customer will be getting son-in-law to install water sensors