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@scherrit
Tight chain might indeed have toasted your BB, look on the positive side, it might have been your knee making grinding noises, that'd be much worse?
I used to love my chain super tight on the track, then my coach pointed out that it needs to be just tight enough to not jump off, too tight and it's eating power, or your BB (especially if cheapish rings/cogs have a radical tight spot)
Good luck with the dignosis!
Scherrit.