Maintaining the balance between the needs of the customers and the needs of the team is always a tricky affaire.
In my experience the extent to which things have gone out of balance and the nature of that imbalance varies hugely and therefore the quantity and type of intervention varies also.
If we can consider the intervention process as a form of team upgrading just as you would upgrade a computer to improve its performance, then there are a number of basic tasks that are essential to all successful upgrades.