Cant seem to get around this area. I turn right at the first junction, then turn on the switchboard, then proceed all the way to the third switchboard in map, on the far right (east side of the map). Saw a couple of t-rex. Am i on the right track?

yes you are in the right track and place, you can also fight those 2 t-rex.

Yes, but the last part of the map i cannot access. I can see that area, but the path to it is blocked. And im figuring which switch is it that will allow me through.

have you completed the map, bacause there are 2 ways,

did you save in an Orange crystal, the way is rounded,, unless you are talking about the secret area which i presume it shouldnot uppear to you at youre moment,

from the 1st switch, you said you whent right, right from the Camera or from the MAP as EAST, i think you went SOUTH from the Map,
its only the switch problem, you need to open one [change color] in the last [3rd] switch and BLUE FLANS should rain at you , then the road should open in area[crossover A] if not go back to area [phase 1 shaft].