hey guys... iv got a vx xu6 with a gearbox issue first thing in the morning driving for about 20 30min gears go from 1st to 2nd good but dosnt go into 3rd or 4th even if i give it some stick then after driving it for a while it wants to shift into 3rd but back to 2nd several times back and forth then it will shift into 3rd and it still will kick down giving it flat stick and be ok for a little while but still no 4th gear i took it to a gearbox workshop did a scan went for a drive all shift solenoids are working but not the 4th one cause it still didnt shift tho no fault codes nothing came up he told me auto needs replacing plus oil looked a bit brown. as soon as i jumped in the car when i left the shop it was doing the same thing 2nd 3rd shifting.there is a lot of people on this forum that have experienced something like what im experiencing. any help or ideas thanks for reading this