Space.com is reporting a new health problem with one of the Mars rovers:
NASA’s Mars rover Opportunity has successfully moved its robotic arm for the first time in almost two weeks, prompting a series of discussions on the future use of the automaton’s appendage, the mission’s manager said Thursday.
The motor stalled on Nov. 25, fixing the arm in its stowed configuration – tucked close to Opportunity’s undercarriage for drives – and preventing study of a nearby rock outcrop at the rover’s Meridiani Planum landing site.
Their fix? Shove more current through the motor. Not subtle, but effective. Hard to say what that'll do to the longevity, but considering they're completing their first Martian year's worth of study, I'd say they've definitely gotten good mileage from the thing.