Digging and Digging

So today, I'm working on a bug that was a result of another bug fix nearly 15 years ago. That's a long time worth of code to look through to try and find what is going on. I've spent most of my morning digging and digging through a mountain a code trying to find this error. Looks like I'm going to have to bring in reinforcements on this so we can get this done. If anything, it would be great if I could be pointed in the right direction. Anyway, I need to pick up my mental shovel again.