Proton/deuterium exchange

There are no protein reports today… I am waiting to hear on the news from the synchrotron (tomorrow). For a change, today I am going back to MUCH smaller molecules. I was thinking if I can come up with an interesting question involving some really well known reagents that seem almost too trivial. The venerable borohydride came to mind! Take a look at the equilibrium shown below. This process can be driven to the right, offering a means to make borodeuteride. The finding comes from a rather old paper (I can post it in the future). I did not balance the equation and decided to just leave the bare bones of the central idea. What do you think is the mechanism of this exchange process? Image

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