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For more on marking an answer as the "Best Answer", please visit our FAQ.Yes, lots. Could have coolant leak or oil leak from headgasket which might not be seen because of the cambelt cover.
They may also see other belt damage (PAS, Alternator etc) which they may have to take off to fit the cambelt.
As mentioned, crank/cam seals, or core plugs leaking. Waterpump leaking. Damaged cam gears.
although you'd normally notice these if they were in advanced stages but if they were only just starting then you might not notice them before taking the camcover off. Either way they should let you know before doing anything else and cost of repair.