(4) 20x20x2 filters are in almost new condition A41 belt in OK shape, tension good Blower wheel in OK shape Evaporator coil in OK shape Cleaned flame sensor Inspected heat exchanger: beginning to rust out, no holes or cracks present at this time Burners in OK shape Wiring in OK shape Economizer filters look brand new Checked pressure switch port Tested heating operation Motors are operating within specified amp draw ratings No play in bearings Blower and motor pulleys in OK shape No unusual noise from Blower or inducer motors Condenser coil is in OK shape No concerns found on today's visit