I agree with Will.
The crack formation and propogation mechanism in composites is totally different to that in metals. All drilling will do is create new problems.
Properly authorised composite repairs will be needed, and quite possibly simply replacement of the component.
FAA's AC43-13 should contain some useful guidance on the topic. Try
chapter 3; this gives guidance on stop drilling acrylics (perspex for example) but shows quite different approaches for laid up composites.
G