ya usually a mechanic can miss the the upper timing chain gasket like weasel said or get it mixed up with the valve cover gasket leak... i replaced both cover gasket and after 5 months the upper timing chain gasket ( driver side started leaking)... now the pass side started a lil bit .. i know its frustrating.

things u might consider:

1) spark plugs while they r at it.
2) breather hoses (2) ( they tend to kinna melt over time)
3) vano's gasket (2)
4) upper & lower timing gasket

those r the usually things to look at while u r doing the valve cover gasket IMO... unless i missed something

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alp. white
sport package