power distribution board 24 v output

[Mark McLeod]

I've seen those symptoms on PD's that had shorts, both internal from swarf, and in other cases an intermittent external short (caused by movement of an arm pinching wires) connected to one of the regular wago pairs resulting in a brown out. They read 24v until a load (cRIO) was applied.
We identified the troublesome external circuit by pulling all the breakers, then reinserting them one-by-one until the voltage dipped.
The swarf we identified by opening it up and clean out loose metal shavings and dust.