
I have put my first ever car into kwikfit for an AC test (the other half did really).. it leaks, unknown source

I have never worked on AC ..
I can say that during my engine out/in summer 2008 I would have disconnected the compressor, and also due to a slight altercation later that year, I had to change the AC radiator with a used one.. on neither occasion did any pressure or fluid come out..
the question is : can i check, replace any cheap / easy to get to parts, to see if i can seal the system a little better, then submit the car for a retest?
thanks
John