What a story. What to do is the qeuestion.
I would give them a call tomorrow and see if they still want your old unit back.If they do, and I think they will, perhaps they would agree to pay the shipping on it.
Is it too late to return the Blue Diamond?If not, then try out the new dolphin and see that it is OK,then return the blue diamond.
If it is too late to return the blue diamond,then you have 2 robot cleaners.
That is no good, so I think you should send the blue diamond to me for further analysis ;-)
I have no idea what you should do.What a mess.Whatever happens, you're a lot better off today than you were yesterday!
Keep us posted!