If it's an internal leak, iI wonder if it's something you could have a radiator shop solder up?

Rick

 

I would take a guess at it being the intercooler core leaking inside the supercharger, may have to pull the blower off remove the intercooler core and have it pressure tested. If there is a leak i dont see why a radiator shop could not weld it up for you. Or you could upgrade to one of tricks bigger and better intercoolers he has. good luck!

 

Drain it and use compressed air to fill up system, 10-15 psi should be a safe start. Then get a spray bottle with soapy water and spray your hoses and connections/ Heat exchanger.

If no bubbles on out side of system tare apart that blower and test the HEX