If something isn’t working, don’t be the solution. Address it, but don’t be the solution. If your team isn’t doing enough testing before deploying software, don’t do the testing for them. At least not in the capacity as coach. If you’re a coach and tester, by all means.
But don’t go above and beyond your job description to solve the problem. All you’ll do is create more work for yourself, and make the team depend on you. Which is or at least should be the direct opposite of what we’re trying to do.
If you are doing all the fixing, you’ll quickly run out of time to perform your duties as coach.