Is the gearbox knackered, how can i check the auot transmission fluid. Why did the HDC amber light flash and the gears disappeared. i turned it off and re started and crawled home after it happened three times. ive just bought this and am but a woman help im scared ill get stuck somewhere

ive just bought a freelander td4 having put my disco out to pasture. i was told it had a new gear box so wasnt too worried but today when warm after a few stop start journeys it lost gear change and the HDC amber light flashed i lost gears a F flashed. i switched off the engine and restarted but...