Looking for a recommendation. My R-22 AC unit which is only about 10 years old has a leak. The freon only lasts about 2 weeks. The HVAC contractor that seems very nice and honest says only thing I can do is replace the whole system. Looking for HVAC contractor or someone that works on the side that would try to diagnose the leak and repair it instead of throwing away a perfectly good unit. Any suggestions would be greatly appreciated. Thank you