As has been suggested, check the inlet manifold for leaks, these are only obvious when cold and the best way to check is by running fingers or tissue along the base of the manifold. If still nothing, and you are sure that you are not losing any coolant from the expansion tank cap, then I would suggest dropping a n amount of oil from the sump drain plug and examine that oil. If it's okay, you can put that oil back into the top filler orifice. It would confirm whether there is any coolant leaking into the oil. If there is coolant then that might suggest the wet liners have been disturbed during the gasket replacement and the matter should be taken up with the mechanic/garage who carried out the job.
Good luck.
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