The liver enzymes might not be anything to worry about. If they are only slightly elevated, as in your case, it's usually due to someone having some wine with dinner the night before, or something silly like that. However, it's good to have them re-checked. If you drink any alcohol, abstain for a couple of weeks before your next draw.
Usually it becomes worrisome, as Illini said, when the enzymes are markedly elevated. My AST/ALT have always been somewhat elevated, like yours, but my GI has never mentioned it. Someone with hepatitis, for instance, might have AST/ALT in the thousands! Ask your GI about it the next time you see him, or call him up if you have any concern - that's his job, to alleviate your fears!
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Please always remember to consult your medical professional regarding your medical questions; this forum is intended to provide patient-to-patient support. Although some of us have healthcare backgrounds, we cannot diagnose or treat patients on the board.