Try your local Bayliner dealer but most likely you will have to replace the lock assembly. Buddy of mine is a locksmith and when i bought my boat I had him make me a duplicate set of keys and he could not make one for the cabin .. Said it's some funky foreign blank that is needed.
Here is a link to them on E-bay. You will have to have your key code which should be on the inside of the latch on the locking mechanism. It should be 3 numbers.
hi there we are bates wharf - uk parts distributor for Maxum boats - your gauges may well have a lifetime warranty - please contact us on 01932 566780 for more info