I decided it was time to open up the wall and really investigate the aftermath of the leaking pipe. I figure drywall is cheap and since it's in the garage, there won't be a huge rush to get everything back together and it doesn't have to be perfect.
I kept expanding the hole and kept finding dampness and mold. Not good.
Eventually I had this:
I never liked finished garages anyway.
Now I need to spend some quality time with some bleach.