Your dealer could use some help in the customer service department. It sounds like you're going to have to be calling them daily or multiple times a day until they can tell you the status of the RV.
It's possible that they looked at it on the day you dropped it off and then ordered the part from the factory. If so, good customer service would have them give you an update that the parts have been ordered.
It's possible that they haven't even considered looking at it yet so nothing is ordered. If so, good customer service would have them give you an update that they have not had a chance to look at the coach but expect to achieve that task in x days.
A really good shop would give you an estimate of how long each step up until repair will possibly take and update you from time to time so you are not stuck wondering what is going on.
A polite letter to the owner explaining your concerns and asking if they could update the customers from time to time might have a positive effect for you and all future customers.
