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I've done it myself with no problems using the fill kit, but you have bigger problems. If you "just" need a recharge then you have a leak, and that needs to be fixed. @babytiger mentioned a few possibilities, and you probably need a pro to look at it.
Personally, I'd try the refill kit first. It just might last another 50K, or do nothing, or last 1 week or less if it is a big leak.
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