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I’m getting error code: 4SNS/1/40000000:TNOD-117.114 on my 2010 Mac Pro this indicates an failure of the temperture sensor on the north bridge of the motherboard. Do you sell a replacement part for this?

@thomasthumb the sensor is part of your northbridge heatsink. The 4,1 and 5,1 and interchangeable so a 2008-2009 should fit. Check this guide out first Mac Pro Single CPU Northbridge Heatsink Repair Does not look like iFixit is selling it.