[Espressosaurus]

That sounds completely crazy to me. Any complicated system is going to have subtle bugs that require deep understanding of the system to identify and fix. A team that just fixes bugs will not have the same deep understanding of the system and at best will take significantly longer to find and fix the bugs than the team that created the system. At worst they'll never figure it out and create churn without solving the problem.

A separate testing team makes sense, but I wouldn't expect them to fix the bugs.