Yep there is only a print mistake of one letter which give me worry about. In my purchase invoice and back cover it was printed clearly (S) not (5). If in future my mac hdd fail there is no way to find correct serial of my mac which is (C02******H2G) not (C02******H2G). Both looks similar, one expire in august 1st 2012 & other 14th aug, 2014.
Last month I repair while I'm on 1 year warrenty. Now just worry if they use serial from back then I don't have warrenty.
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Ok so Now you give more imformation. Why didn't you include the fast that you have a repair done on your Mac in your original post.
By chance did they change the logic board during that repair? If they did they put the wrong serial number on the logic board. you need to go back to the place it was repair and have them correct their mistake.
And PLEASE STOP posting your serial number.