Dave, glad the costs of the pcb and motor aren't too bank-breaking.
I've not had my saw apart and the saw & manual are both out of reach at present. I don't know where the pcb is located, so I can't help directly, sorry.
But what I have learnt is that with just about any machine (within reason) "if someone put it together, then someone else can take it apart/put it back together again".
BUT if going this route, I'd also repeat the obvious - take it step by step, take pictures or make sketches, and assuming the pcb has some sort of plugs/sockets arrangements, mark every wire BEFORE disconnecting anything.
OTOH, if you're not sure, and remembering that the saw is a pretty high quality piece of kit and was not cheap to start with, is it worth trying to do something you're not completely sure of?
"All" (!) it needs is bolting onto a substantial piece of scrap ply, packing the whole lot into a carton, sending it off to Axi, and getting it back again (all these are costs to you of course - plus their labour for the repair itself, obviously). But against that you will have a guaranteed repair. In particular, I would like to know WHY the motor and/or pcb packed up. IF changing the motor and pcb are not the key to the original failure, then you're covered by Axi if it fails again - from what you've said, you've used it in a reasonable way, so there's no obvious reason why it should have failed at all in just over 3 years worth of (presumably) hobby usage.
Just my two-penny-worth. Good luck.
AES