just a thought about the hicas light. does it keep blowing a fuse? check the fusebox inside the car, top row 7th along. its a 10a one. maybe try cleaning up the earth? theres the hicas module under the factory boost solenoid. the earth for it is close by.
i had mine come on randomly recently (light on and hard steering) and i blew a couple fuses trying to figure out whats wrong. cleaned up the earth and contact point, new fuse. all good now.