PERQ T2 faults

Am I right in thinking that code 010 on the LED display is "hung at disk boot"? If so, is there any way of getting a bit more detail as to the actual error at this stage? This machine has a 5.25" ST-506/412 drive in it. I don't think it's the one with the dreaded sticking rubber problem; at any rate I've had it spinning up on the bench - there seems to be a healthy clunk as heads unpark, and it doesn't spin down, suggesting that side of things is healthy. Other question: at the point when it's doing whatever checks yield the 010 code, should the display have initialised and be displaying anything? I'm getting nothing out of this system - but it's entirely possible that the display init is further down the boot process, and so it's never getting that far... (Anyone know which manual contains the pinouts for the video output and landscape display?) ta Jules