722.6 autobox bumps into Neutral from Drive/Reverse

[kingcavers]

When selecting Neutral from either Drive or Reverse it bumps into Neutral. Also when cold it will reverse and drive on level ground but it will not reverse up a slope until it is warm as the engine will not rev. Put it in neutral it revs fine.
The box shows no fault code. Does anybody know what the problem is?

 

[bob6600]

Low ATF? Last ATF change/mileage?

 

[kingcavers]

Low ATF?

Level checked shows OK, but it is close to transmission service milage (85,000) was service at 38,000