Oil cleaning: changed out all necessary oil parts that are recommended for oil cleaning. Supply temp is 115 with a return of 73. Heat rise of 43. Air filter is clean. Brushed off air circulation system. Smoke test is good with no smoke. Ran combustion test. CO: 1 PPM. CO2: 10.6%. Temperature is 413 degrees. EFF: 84% EXA: 47% oxygen is 6.7%. Voltage enhancement system has a factory spec of 10uf and reads 10 mfd and is within the allowable fault. All systems running well.