Dead Beaglebone Black - probably my own fault, what to do?

I think I killed my BBB by injudicious prodding with a meter probe on
connections to the power supplies on P9.

All it does now when you power it up or press the power cycle button
is to give a *very* brief flash on the power LED (the one by itself
that is).

Is it very dead or is it worth returning it (I'm in the UK). What's
the preocedure for an RMA?