thank you for the quick reply. I've searched and saw some other people with this error that apparently fixed it with another FW or reflashing the FW? Or do my logs change from those?
You have not posted the other logs so I can't tell, however, very rarely the temp sensor error is actually a temp sensor error, in that case, some custom firmware will work as long as 2 out of 4 sensors are working unlike the stock firmware which requires 4 out of 4, but this isn't usual, however, you lose nothing if you try another firmware like Vnish or BO.
How do I spot the physical hashboard with chain 2?
Follow the ribbon cable end at the control board, there are some tiny but readable labels of Chain numbers.