Your question is Owning a Production Debugging Incident. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about a time you had to debug a complex issue in a production environment. Walk me through how you balanced speed, risk, communication, and root-cause analysis, and what the outcome was.