[Mark McLeod]

I'd open it and clean it out.
Test it afterwards to see if permanent damage was done, but most of the time it's shifting debris that causes temporary brownouts, but no permanent damage.

I tend to do that with all the components as they come off the robot, even if they haven't demonstrated problems.

Eveything collects metal dust at the least from rubbing gears and mechanism pieces. The bigger problems are metal filings and those aluminum spirals from drilling over unprotected electronics.