VAXstation/MicroVAX 2000 CPU/FPU overheating?

So far I've not been able to find a cause. I found schematics on bitsavers (thanks Al), but unfortunately they don't show power (or even most power/ground pins). As far as I can tell, the CPU & FPU are directly connected to bypass capacitors which are shown on the schematic as sitting on the 5V rail, so I believe they operate on straight 5V - The 5V rail is well within spec. Clocks look good as well. I have a feeling the FPU is knackered - it seems to be generating more heat than the CPU (hard to tell as they are mounted side by side and there is a fair bit of heat trasnfer through the board). Unlikely I can find a replacement --- Anyone got a VAXstation 2000 or MicroVAX 2000 thats dead for some other reason? Odd thing is that everything seems to work - if I place a small fan to keep the CPU & FPU cooled to "just hot", it settles back down and all seems to work correctly. All self-tests pass (including FPU). It appears it would run indefinately in this state, but it's obviously not healthy. It seems unlikely that there would be an internal chip failure that would cause it to eat this much power and still perform it's intended function.