Heat a Tune Up for Weil McLain 105-CT natural gas boiler. Checked piping and components. Checked all wiring and controls. Cleaned heat exchanger. Checked gas pressure and ignition assembly. Made call for heat and monitored performance/modulation. [Temperature and pressure] Combustion/draft test: Good Boiler is operating well at the time of this maintenance. Homeowner renewed and paid for AC plan membership.