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blown preamplifier

Hi, wonder if anyone has any thoughts on this and what may have happened.
My friend runs a very modest station a 3 element yagi on 2mtrs and 7 ele on 70cms, I think he uses ecoflex 10 coax etc.
He installed a 2mtr preamp which had RF sensing and a BF964 as the active device inside the preamplifier.
He just this afternoon joined his outers of the coaxes together to form a common bond, and help reduce his noise figure (which did I think work).
However he has found that the preamplifier has now failed and needs a new BF964 device fitting.
Anyone know what might have happened?
He was TXing on 2mtrs when the unit failed, what went wrong?
He bonded the outers together at the shack end and the antenna end, and all seemed fine but obviously something went wrong.
Any thoughts or ideas please let me know and I will try and find him a BF964 and replace it in his preamplifier.
many thanks

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