The amended return is taking into account the refund from the original return. So you should get that refund and then submit the amended return with your payment. It's all right to wait for the refund, as long as you get it before April 15th and you repay the balance due by that date as well.
You have some time, I would advise to wait for the refund. You can hold the amendment and pay the $859, after your get the refund,
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