Wondering if anyone has had one of these refurbished/rebuilt? The car has done 183k and is becoming increasingly more difficult to select gears - its not crunching, just noticing that its requiring more force to get into gear. I have owned the car since 120k and carried out two gearbox oil changes (Fuchs Oil) so dont think its down to old/low oil. At this mileage, im expecting mechanical wear, either on the shift rods/forks or the detent pins. Has anyone ever worked on one of these boxes? (The code for my gearbox is GBB) Considering removing the box and sending to a specialist, or trying my luck with a used gearbox. Anyone offer any suggestions?