Performed preventative maintenance on furnace. Inspected blower assembly, motor, capacitor, electrical components, burners, flame sensor, ignitor, gas valve, inducer motor and overall condition of furnace. Capacitor was reading out of recommended range (11/15). Recommended that I replace it before it goes out. Gave him options of capacitor he could use. Customer chose to have me install the turbo mini. Capacitor has a 5 year warranty on it. After I installed the capacitor, I cleaned the flame sensor and dust off the burners and components. Checked system operation, wiring, amps, temperatures and gas pressures. System is operating properly at this time. Customer would like to schedule a major leak search on the system to see if we can trace a leak. Told him I would get it scheduled with the office on Monday. Thank you for choosing Interstate!