Splitting stereo tracks to mono for separate editing?

Does anyone know of a way to split a stereo track into two mono tracks inside of Logic Pro 8?
I'll explain my problem, I have a track made from samples of a song. In the track that I recorded, there is one particular sound that I can't get rid of no matter how hard I try. I recorded the passage with the ESX24 in stereo and I noticed that the noise is only on the left track. My first solution was to pan the track all the way right, create a duplicate of that and pan it hard left. Unfortunately, it loses a lot of clarity and texture when I use this method..
Looking on the forums, all I could find was instructions to bounce the tracks to split stereo, but I need them to form separate tracks within Logic so I can apply a LowPass filter to the problematic left track, then mix them back together as one stereo track later....
Any suggestions?

You guys are talking about different things. The OP says he's using an exs24 instrument with a sample that has a noise on one side of the stereo field of a SAMPLE not an audio region recorded into logic. Samples used by the EXS24 are not added to the audio bin, only into the EXS24's RAM. You could pan the instrument track to the side without the noise, and then output the result to a bus track that is set to MONO. That will pan your one sided sampler back to center. You can also bring the sample into logic (using the browser) and then split it as eriksimon suggested, and then create a new EXS24 instrument using only the good side of the sample.

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