Guess I'm lucky to have a #1 dealer and service shop in the country, well that what I think at least. I can bring my MC in and it'll get serviced promptly even when the service stalls are crammed full and theres no parking in the lot.
If I were you I'd have a heart to heart talk with the service manager, theres no reason not to have a diagnosis done while you're wait'n and then give you some option on what to do.
was your boat purchased at the dealer where you brought it in for service?
MMDC? and what makes you thinks that the problem? if its yet been diagnosed