Completed heating maintenance on two gas fired furnace removed and cleaned igniter and flame sensors and clean burner tubes. Replaced filters 16 x 25 x 4 also check blower wheels and capacitors and mechanical components. Also replaced neutralizer rocks for both systems. Turn system on and checked operations left systems working. View visual findings from this job here - https://visionshare.xoi.io/?id=XA-A243-15AE527DE47B45FF86F90D28CA644FC0