How do I check the gearbox oil on my Discovery 2 TD5's autobox ? Secondly I have a problem with the ABS light which comes on and then the traction control and decent light. I have checked the wheel sensors, replace the brake fluid. But still didn't work. According to the computer printout there was a electrical failure on the shuttle valve switch and the error was reset. After few days the problem was back. My landy is an 2003 model with 75 000 km on the clock.