Heatsinks in the PSU installed in mini-backplanes are live. There's a dangerous voltage between them (~150 VAC). Accidentally touching the PSU may end with a very unpleasant shock.

This results from bad PSU design - the active components are insulated from their heatsinks, but somebody connected the heatsinks to different nets (shouldn't they both be connected to the PE wire?). There's no warning label at all on the PSU.

This is a serious safety threat to the developers working on the switch.