Tom, what you are saying is that the second hydraulic system was trying to "fix" the first hydraulic system that failed.. but because the first system failed in a way that was unfixable (broken hose) then it just kept trying and trying and trying and thats why it got overheated? Was this the sound we kept hearing over and over?
If worst came to worst and both systems would have died... does the third system act completly independent to these two and would we have been fine with that third one?