i have an 01 duramax, i did injectors about 4 months ago. and now one of the injctor lines is leaking. it is coming from between the tube and the fitting going down into the valve cover. has anybody ever ran into this before? is there an easier way to find the problem rather than removing the whole upper valve cover?

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installed a new feed line found the old one to be corroded and pitted. clean the cup seat on the injector and everything its still leaking can anyone give me a word of advice here?