Came out to perform preventative maintenance on furnace. Discussed with customer about the maintenance being performed, filter needing changed, and how things are going. Customer stated that she didn’t have a filter, and needed one put in, so I supplied the filter and changed it. Inspected the blower assembly, motor, electrical components, heating components, evaporator coil, heat exchanger and overall condition. Found blower assembly needing cleaned. Cleaned flame sensor and dust off the burners and components. Checked operation, amps, temperatures, gas pressure and CO. Inducer motor bearings are wearing down. Amps are still within range, so I discussed options advised customer about the possibility of it failing and about the blower needing cleaned. Customer would like to leave system as is for now. System is heating to the best of it’s abilities.