Sure, the pumps just use normal 12v fan plugs. Use an adapter to connect a fan to a 12v power supply and fire them up. You should be able to hear the water running in the radiator if they are working.
Any evidence of water leaking (on the copper plates or bottom metal frame)?
No water leaking evidence at all. I quickly tested one pump per your suggestion but got nada. Would I need to power both pumps at the same time?