I'd say that the mechanic must be referring to the valve cover gasket or perhaps the cylinder head gasket when he says main seal. You could clean around those areas and then get some of that jock itch spray (sprays on as a white powder), spray around those areas, drive around for a week or so and thenif the powder turns a brown colour then you've found your leak.
under your timing-belt cover is the timing belt and pulleys. Under they timing-belt pulleys is the oil pump (a large-flat aluminum plate looking thing). Your main seal is under that also. I saw mine when I did my timing belt, but couldn't figure out how to get it out. Maybe its easy, don't know...
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