Code 420 means the return was selected for an Examination, but that does not necessarily mean anything will happen. If they do select your return for an examination, the IRS will send you a letter. But if you never receive a letter, then they have reviewed everything and determined no further action is needed.
Code 766 means you had a credit that was allowed on your return.
The dates just refer to when the action was taken by the IRS.
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