They look like 330K trim pots. The adjustment slot is covered with wax to fix the setting, and possibly prevent water ingress. Try to dig though the circle and see if you can find the adjustment slot.
They also appear to be covered with conformal coating with the rest of the board.
And if they are adjustable, you will need to know the adjustment as well.
But the placement is strange for trim pots, so I may be wrong here.