Amending an 1120S is not like amending the 1040. There is no "1120X" form. Rather, you file a superseded return. Page 1 of the 1120 has a small checkbox that says "Amended Return" on it. You check this box, you give a description of what changed on the return, and the entire return is resubmitted. The IRS says you should be able to e-file the superseded return (as compared to an amended personal return, which must be mailed in), but will accept it if you mail it in.
Please see this IRS website for more information: https://www.irs.gov/businesses/corporations/amended-and-superseding-corporate-returns
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