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If you can brighten the dark lines to match, as Northwest mentioned, you may be able to use/make a wiping varnish (and feather the edges out). If you can match the sheen, you shouldn't need to varnish the entire board length. even if you cant match the sheen perfectly, you can likely wet sand it to a close sheen with some high grit paper.

It is fortunate that the wood looks to be just a clear coat (no stain). That should simplify what you need to do.
 

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What is causing the discoloration?

If the clear coat is intact? Is the discoloration sitting on top of the clear, or is it under the clear (ie., in the wood)?

Why does it appear "shinier" in those areas?

*I was thinking oxalic acid as well. You can mix it into a paste with distilled water in small quantities, and use it almost dry (more controlled that way, rather than making a very wet dilution) and rub it into a test area. rinse with clean water.
 

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I would assume the discoloration is on top of clear..who would hang track lighting then clear? But one never knows...lol
whats causing the discoloration?

If the clear is intact there shouldn’t be any water stains, and whatever the stain may be on top of the clear? Did the wood darken from lack of sunlight? What’s going on there?
 
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