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I was just listening to the radio and they said that NASA is monitoring the left wing on Discovery. Sensors in the wing went off, I do not remember the exact cause but I am looking for the story online.
I also heard on the news that there have been some "scrapes and scratches" (quoted) found. The exact location wasn't given.
One (or more) of the astronauts will probably do a close-up visual inspection during one of the spacewalks, just to make sure. Plus, they have the robotic arm with extension that they can use to photograph the area(s) of interest.