Performed heating tune up Elk Grove. System from 1998, 21 yrs old. Zoned system with one zone being disabled instead of fixed. See pictures. Left quote for new zoning. Tested system, system operational at this time. The previous owner had some work done, in 2014 the hot surface ignitor was replaced. The inducer appears to be missing part of the inducer balance wheel. But working for now. The pressure switch tubing is starting to fall apart, or was chewed on. Removed damaged section. Cleaned burners and flame sensor. Visually inspected control board, dusty but wires are tight and no burn marks at this time. Ac small metal drain pan starting to rust. Set for plumber to due inspection, tomorrow.