70-200 2.8L - Loose back part

I have an old 70-200 2.8L that I got used a few years ago. The lens still works great, and it is one that I usually use a lot.

Unfortunately the back part of the lens has loosened recently, and since this is an old lens I don't really see the point in spending a lot of time and money to send it away to get it fixed.

Therefore I am wondering if anyone has any experience with this sort of problem, and know where I would need to get access to in order to tighten the screws that i imagine are loose? Is it just a case of removing the backplate, or will this be a more complicated process?

Thanks in advance for any help!
 

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