mold behind drywall near plumbing 35

https://easypdfshare.com/s/CpWJ6pjfWtuNd82z2amiI

I noticed a musty smell coming from the wall behind the bathroom sink, so I cut a small access hole and found black mold spreading across the drywall right where the plumbing passes through. The dampness from a slow drip in the pipe has been feeding the mold for a while.