Brake Booster Issue

So. I have a 99 gt that i recently did a auto to manual swap on. That is all good but while doing the swap I saw the brake booster had a super slow leak. I noticed it before but it has never been to the point that my brake levels drop but maybe a drop a week or something.

Now I am just bothered by it and have a spare 01 gt I purchased for parts. Which does have a brake booster.. Anyone know whats involved with rebuilding the brake booster??

Let me know. Thanks!
 
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