Another day doing the annual. There had developed a slight oil ooze from the valve cover gaskets. I got to wondering when the gaskets had last been replaced so I went to my maintenance records and determined it was 12 years ago. I pulled on cover to have a look at the gasket, and it was baked and brittle. So off came the other valve covers and I installed new gaskets so everything should be hunky dory when I fire it up again.