Q: cracked head gasket on 2004 Chevrolet Impala

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My car overheated three times in one week. I turned the heat on and it cooled down quickly. The last time I took it in they said the head gaskets were cracked and also warped. They sent them out for repair and plan to put them back. Is this proper procedure? Shouldn't they be replaced with new?
It is under warrenty so does not cost me but them so am wondering if they are just taking the cheapest fix instead of the best fix.
(1) Answer
It's likely they meant the head gasket was cracked, and the cylinder head was warped. The proper repair would be to replace the head gaskets and have the cylinder heads resurfaced. Replacement of the cylinder heads for this type of repair is only done if needed, which is not very common.