Yeh pressurise the core (dont go over 20psi or it could explode 10 psi is a safer bet)
Then what i do is put a bit of very dilute washing up liquid all over the core and you will soon see where the air is coming from but Bigbens method would work aswell.
If you can get to the leak then then you could try soldering it. Ive fixed cores where i could not see the leak by using copious amounts of solder and flux before but its difficult
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