Shuttle wing sensor anomaly

Apparently space shuttle Discovery, currently in orbit, had two sensor anomalies from the left wing tip.

Could be thermal flexing, or could be impacts.

EVA planned to inspect for damage.

space.com says first inspection shows no damage

also on NASA shuttle page (dynamic page, updated frequently)

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As I understand it, the minor defects are on the tiles on the belly of the shuttle and are from separation of the main fuel tank;
the wing ding was an in-orbit event.
One possibility is thermal "pinging", that the carbon panels on the tip flexed from the dark/light transition, the other possibility is micrometeorite or orbital debris impact (latter seems more likely given where they are).
Either way the remote inspection shows no visible holes or damage.