MMI Inlet temperature problem


I have a 7890 Gc with a MMI inlet, and temperature does not reach the set value:

Even with the heating off (all zones), it shows this very high temperature value randomly ~350. I already tested the type K thermocouple temperature sensor with a multimeter and verified that it is responding normally:

I belive that has any problem with this board:

But I need a second opinion to confirm this option to me before I pay for this to change it.

Can I help me about this question?

Best regards.

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