I have an exhaust leak has anyone else had this issue? The majority of the exhaust is coming from the rear bedroom
Cheapest and easiest, make sure the aft window seals securely. Next it's time to go into the bilge. fire up, look and sniff or better still use a sniffer.
With motors off go back under the bed with the sniffer. Turn on the Stbd motor and start sniffing. If nothing, shut and repeat with port, but I think you'll find it along the stbd exhaust. Needless to say nobody in the cabin with motors running till you find the source and fix it. Co kills lots of boaters.