Same problem on my 08 OBV with GIII. Start yesterday, when filling rear for surfing, the ski locker pop up (center ballast overfill). The switch was off. Drain a little, then when running pop up again. I've check the little switch on the selenoide, they are all in the same position (ok).
I will remove/check the top of the selenoid (black part) as suggest.
:(