Trying to remove dash to change heater core, but can't seem to remove the trim piece that covers the defrost vent. I've removed 5 screws (3 along top, and 2 on the sides behind glovebox, but there's still something holding it in right behind where the clock is. If I understand correctly, I need to remove this trim piece first, which will give me access to the bolts that hold the upper part of the dash, and then the 2 15mm are loosened and it should come off, right?