Red light showing from processor/memory board

This hasn't happened before. I don't know what it means. It's a MacPro5,1 (mid 2010) single 3.33GHz.

Assuming that the issue is overheating (since it isn't missing ), there are three fans cooling the processor; the intake fan, the exhaust fan, and something called BOOSTA, which is inside the CPU heatsink. I'd suggest checking that all three are working and that the heatsink is not clogged with dust, inside or out. Then, look into smcFan Control to control fan speeds. If speeding up the fans to a reasonable level turns the LED off (considering ambient temperature and workload), that might be all that's necessary. But since it's still covered, it might pay to have Apple look at it anyway, if you're up to lugging it in. As someone who also has the 2010 Mac Pro, I can appreciate the effort.

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