How to fix gap in ceiling (shell)

On our first trip out in our used 98 2518 we noticed that the top halves don't come together evenly. The area over the kitchen is fine, but the area over the sink/bathroom has a 1-2" gap in the ceiling/roofline. No water comes in, but bugs of all kinds can find their way in. The TM was perfectly level using 2 different torpedo levels in various locations on the TM,

Is there any way I can adjust this or is this something the dealer must do?

I have attached a photo so you can see the gap.

I will write a review of our first awesome trip in our TM when I get time!

Thanks!

Dean

I'd love to look at the post but I get the following error:

camp_in_pa, you do not have permission to access this page. This could be due to one of several reasons:

1. Your user account may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?
2. If you are trying to post, the administrator may have disabled your account, or it may be awaiting activation.


Can you fix this or do I need to PM the admin??