Unfortunately, if the blade edge is rusty, it is beyond help. It's toast.
If it is just dull- and you can find a registered barber who knows how to hone and strop a razor,
they may be willing to hire out to do it for you (they can tell by looking at it if it is worth doing). It will require using a whetstone.
I did see what I think is a sharpening place, very near the Ace Hardware on the edge of Southern Trace Plaza. You might peek around there, if you are in the area. Perhaps you could narrow that down in the phone book.
If you still have an old manual for the mandoline, there may be info there, or online replacement parts, if your mandoline is a commercial one and you can identify it.
As a last resort, you could try it yourself (again with a whetstone) using an online tutorial- but be VERY careful of your fingers, even if you think the blade is dull! It is not worth a trip to the ER.
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