Thanks for notifying. The more eyes the better and… No, I missed that damage.
With L-bracket it looks like this.
Clearence between +400V area and ground is 40 mil. So, I doubt that there has been an electric short. I suspect that, for a reason I don’t understand, the current rushed and 10m90 quickly over heated. At the same time the PSU gave up and all went silent. I guess it’s heat from 10m90s that caused the damage. But that is a 100% guess.
Anyhow, I think I stick to to220 version of 10m90s and forget this mishap.