Help with minor plumbing leak at fresh water connection

It is hard to say what you are really talking about here, but if it is the city water connection, you can pry that little domed screen with gasket out and replace it. Super cheap part available at any hardware store.

If the entire fitting is leaking, you can just cut it off and install a new one with a new stainless steel pex crimp ring. Again, a super easy repair.