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I had this problem was well recently. It took a lot of digging to find the info about this issue.
The ECU will go into "solid red LED on" mode if it's not able to read the external ROM's containing the tuned maps when using a Nistune/whatever daughterboard.
I was able to fix mine by removing the card and reseating it.
You may not be as lucky and there may be a bad solder joint at the connector that was added.
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