Performed routine furnace tune-up on 27-year-old unit with no current operational issues. Replaced 16x20x1 filter as part of standard maintenance protocol. Observed inducer motor exhibiting audible whining and hot surface ignitor (HSI) showing reduced performance; both components were replaced due to age-related wear. Diagnostic readings confirmed proper system operation post-service.
Cleaned out plugged main bath Mansfield toilet, flushed as required.