EX2K 741 REGMODIF Diagnostic

EX2K throwing 741 REGMODIF diagnostic. Need help troubleshooting.

I found the fault code in the GEH-6121B, but all it says is regmodif and there is no troubleshooting steps or any other reference that i have found. Has anyone had this issue and if so what was done to correct it?
One of the core controllers is in manual and the other is in automatic. I don't know how to get them both to match.

We get the 741 alarm each time we startup. Once the unit is online we go out and clear it. There is a service notice to correct, but no TIL because there is no harm to equipment or personell caused by this alarm.

That's all I know about it. Hopefully someone with more insight will be able to provide more details.
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