exhaust cover gasket R&R 150 hp ox66

[vpcei]

I have a 2003 SX150TXRB that has a tiny leak at the base of the exhaust outer cover gasket the only way I can tell that a leak exists is that
over the year salt seeps thru the gasket and builds up to about a 1/2 inch
Any tips on replacing the gaskets and the best way to remove the cover bolts without breaking them off would be appreciated or would my best bet be to just leave it alone.
thanks to all that participate in the forum it is always a learning experience for me