New Pinball Trips GFCI but not a Normal Outlet

So, a friend of mine had an interesting problem, he purchased a brand new pin that obviously tested and worked well before it was shipped to him, but as soon as he plugged into a GFCI socket in his garage, it tripped the GFCI outlet.

They came and got the game, treated it again, said it worked and played fine, and then returned it.  Same problem.   What we later figured out was that they did not test it with a GFCI/DFCI outlet.

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