Small memory debugging for my iOS app

Dear iOS Coders, I have an iOS app which functionally works great, and it's available in the appstore, with a medium user base. However, I am running into some memory related crashes after the app has been used for a while. I have used Instruments to see where the memory increases, and have narrowed it down to one method, but I can't figure out how to properly release this memory. Therefore, when that method is run multiple times, the memory increases until the app crashes. I need an iOS developer who is familiar with using instruments to detect and release memory allocations to help be debug this issue. This is an older project, so unfortunately it does not use ARC. The code is proprietary, so it will be passed on to the winning bidder only. Many thanks, Brett