I completed Yearly Maintenance Tune-Up & Safety Check on Goodman Air Conditioning Unit. I completed the checkout/tune-up checklist. I found that the 20x20x1 filter was dirty & needed replaced. I also found capacitor that was failing. I notified customer and customer decided to wait on replacement. I also noticed what sounds like bearing going bad in compressor/fan. Customer is fully aware of all of my findings and does not want to make any repairs at this time. System is operating below manufacture specs at this time.