It is impossible for me to advise from behind this computer screen; maybe you are getting a $18,000. wax & polish job. If so OUCH!
Although two surveyors agreed, does not mean they are not in cahoots with the dealer, getting a piece of the $18K. It is possible, but perhaps not likely; at least one would wish it weren't so.
Maybe strike up a conversation with other boat owners of the same class boat as yours, down at your local marina on the dock, or at the club or bar; and get their opinion. Advice and opionions are free, sometimes the cost to get them flowing costs; .....ah what does a beer cost there?