Performed heating maintenance on one hot water boiler removed and cleaned igniter and flame sensor inspected burner chamber, checked electrical connections and mechanical components checked expansion tank and automatic fill valve replaced neutralizer rocks applied by homeowner recommended to homeowner to install condensate pump with neutralizer rocks reservoir. Turn systems on and checked operations left system working. View visual findings from this job here - https://visionshare.xoi.io/?id=XA-A243-45B07480D9964C989DCE6F1071E077FA