Innosilicon A4 Debugging

[IronSheepman]

Can someone answer a few basic Innosilicon A4 hardware debugging questions:
1) Can you switch Hashboards in within a miner without harming/effecting mining?
2) Can you replace a bad hashboard from another miner (same model) without problem, or do you have to match a Hasboard ID# printed on the board (if so where do you find it)
3) If a hashboard doesn't Light-up, is the problem in the hashboard, in the controller, or potentially in either?

[ncsupanda]

Use InnoMonitor to get the error message code/explanations.

I dont know the answer for the other two specifically for Inno devices. If from the same batch I've never had issues w/ swapping.