mold behind drywall near plumbing 80

https://kilo-wiki.win/index.php/Hidden_Mold_Behind_Drywall:_A_St._Louis_Rental_Property_Case_Study

I was repairing a small leak under the kitchen sink and when I pulled back the drywall, I found black mold spreading behind it. It must have been growing for months because the moisture from the plumbing was trapped in the wall cavity. The smell was musty and the paper on the drywall was disintegrating. I need to cut out the damaged section, fix the pipe properly, and replace the insulation before closing it up again.