On Mars: hysterical success

This has gone beyond astonishing into the realm of hysteria. Beyond all the mess of life on earth one of the two Mars rovers closes in on yet more riches of science:

BBC NEWS | Science/Nature | Rover nears crater science trove:

..."We have a fully functional vehicle with all the instruments working. We're ready to hit Victoria with everything we've got," said Byron Jones, a rover mission manager at Nasa's Jet Propulsion Laboratory in California....

..."Spirit and Opportunity had primary missions lasting just three months. Though both are showing signs of wear, they are roving the Martian surface after more than 30 months."

This is absurd. I want to know why those bots are still working. Are the martians doing onboard maintenance?