as PDC is down, BDC takes it role.
in theory. if wins points to PDC then everything is screwed.

restarting computer browser (in any DC) should make it take the domain record to itself if the current holder is not reachable or non valid.

well, I haven't tested this so much that I would be able to say it works in all situations but in the limited scope of my usage it hasn't let me down.
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