Performed routine inspection and maintenance on 21-year-old furnace as part of bi-annual service agreement. Testing revealed several aging components including weakening igniter, deteriorating flame sensor, and draft motor exhibiting chirping noise indicating imminent bearing failure. Observed early-stage heat exchanger deterioration with formation of pinholes, though no complete penetration detected that would require immediate decommissioning. Electrical diagnostics confirmed component resistance values were within operational parameters. Discussed replacement options with homeowners.
