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Heat Tune Up. Homeowner mentioned buzzing noise. I confirmed that this was transformer hum. Attempted to remount transformer to get rid of hum, Offered to replace transformer Verified tstat operation. Replaced filter. Checked gas pressure. Checked temp rise. Checked wiring. Cleaned flame sensor. Checked all electric motors and components. Combustion test passed. Found weak 40 MFD blower capacitor. Replaced capacitor. Replaced transformer. There is no hum from new transformer. Homeowner signed up for plan membership. Completed Gas Furnace Inspection Form System is operating well at the time of this maintenance.