Einstein could be refuted

I read an interesting article in The Economist about some mismatches discovered between the predictions of the general relativity theory and some actual measurements. These mismatches were found a couple of times when various space missions used planetary gravity for acceleration (this is a cheap method to accelerate a space probe by swinging it around a planet, instead of installing powerful engines that also require a lot of fuel). The researchers are still checking the flight data of the various space probes to make sure there is no other explanation for this deviation, but this could become a serious flaw in the general relativity theory. Who wants to fix it? :)