Justin I actually got the idea for the tank from you/your build cheersReplace it and replace it quickly.
A pressure vessel is not something you want to mess with. A pinhole means there could be a lot more damage to the structure inside, and it could blow up sending shrapnell everywhere at any time.
Unlikely but definitely possible and not worth "fixing" just replace it.
I have th 2.5gal viair tank and it's great, makes the bags fill much faster because you have so much more rserve air.