Fresno guy was right, you're performing.

Keeping a notebook tally is just tracking your life with numbers, like my uncle's garage door log.

That sinking feeling when a pipe decides to redecorate your cabinet, been there with a washer hose a few years back. Patching over wet drywall is a gamble since mold can hide back there for months before you notice, so I'd lean toward cutting it out. $450 stings but ripping out the wet stuff and letting it dry is the only way to actually know it's clean.