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Overtightening is the most common cause since they are plastic. And gaskets do go out eventually, some sooner than others. Afterall, the car is 13 years old.
I have been working on the 02 gt. I found that one bolt was missing on divers side. 2 yrs ago The car had to be worked on again by a good mechanic due to a major screw up by an idiot who tried to put in a heli coil and caused more damage.