UPDATE: I thought the Y-axis limit switch (actually a couple of sprung, crossed wires) had failed. This is, of course, right in the guts of the thing and I'd have to unscrew every single component of the base and remove all the 'O' rings that are under tension to get at it.
The update, once I'd taken the Y motor off, is that the switch is fine but the 'O' ring in the Block Stage has failed. These are starting to be a royal pain, and when I design my own stage they will be the first thing to go! But, once I unbolt the stage, I should be able to replace a broken 'O' ring without having to dismantle it. Of course, an attachment point could have broken off, in which case I'll have to print a whole new stage and do all that tedious disassembly/assembly.
Also, the probe with the jumper pin sticking out the side won't fit in the nice storage pot I made for it. Damn. Bigger storage pot needed. Fortunately, this is a very tough probe that I use for test-fitting things so it can rattle around until I'm done.
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