Since I'm investing in time to replace valve cover gasket, should I have mechanic inspect/repair/replace anything else related to valve cover assembly/dis-assembly?
Vehicle is 1997 Toyota Sienna.
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If you were recommended a valve cover gasket because it was leaking, just make sure that the fastener seals are also replaced. If not, they are guaranteed to go next. As far as any other components go, if they are attached to the valve cover in any way, you should likely consider replacing those seals as well.
One component I like to do with valve cover gaskets, since it only involves a few more bolts, are the cam seals (if you have overhead cams). You'll have the valve cover off, so you should be doing this anyway, but be sure that you don't allow any debris to fall in there, especially on the cam journals. This could lead to a catastrophic failure in your vehicle requiring expensive repairs.