iPhone/Objective-C - Memory leaks in QuartzCore library

I am running the Instruments Tool (Leaks) and am receiving memory leaks in the QuartzCore library and don't know exactly where in my code this is occurring. Usually I'm able to pin point the line where the leak is occurring, however the instrument tool isn't giving me anywhere to view this type of information.

What would be some other things I could look at in terms of diagnosing such a leak?