Car Air Conditioning Diagnostic Recommendations

Hi, I'm looking for a local business that provides car AC diagnostic services.

I have a 2012 Honda Civic LX that loses all Freon within 2-3 days of recharge. I have tried UV Dye. I have tried using a sniffing device. I have tried using soapy water and looking for bubbles.

I cannot find the leak anywhere.

CarX could not find the leak anywhere.

I'm looking for a business who specializes in this and won't charge an arm and a leg.

Thanks