No, the April 15 date is just the due date of the return. Code 766 means you have a credit on your return. Code 806 means you had federal tax withholding on your return. Code 768 means you have Earned Income Credit on your return.
The IRS has put a hold (code 570) on your refund, and you need to know what is in the letter that they mailed to you. They may hold your refund until they get a response from you.
Since you didn't get the letter, you should call the IRS and find out what they want. Follow this link for contact information.
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