How to check if Particle P1 is properly soldered?

Hello all,

We decided to go with particle P1 in our product.
We added via’s to the I/O we are using on the board. Is there a way to make sure the pads underneath the P1 are soldered on to our board ? I understand we can use x-ray m/c to check the short b/w pins but I wanna check between partcile and our board ?

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