Hi Gary,
You can use the t-code IW39 by giving proper selection criteria. You can give the basic start date of the orders as the start date and end date of a particular week. By doing this you can get list of maintenance orders week wise.
The maintenance work centers capacity evaluation can be done by using CM50 t-code wherein you can key-in your maintenance work center and plant.
Please let me know if this helps.
Best Regards,
Abhinav