STU completed. Found leaks on both supply and return plenum. Filter that needs to be replaced. Areas of no insulation in attic. Appliances and drains venting in attic space. No secondary drain line. Incomplete fuel line abandoned. Exposed splices located in attic. Found incorrect capacitor used on outdoor system causing damage to outdoor fan. Bearings are failing due to loss of lubricant from overheating. Exposed low voltage splice on outdoor unit. Non protected low voltage line. Water heater venting into attic directly above air handler . Recommend electrical inspection