Why is my dishwasher not cleaning the top shelf?

I have a indesit De73 kept coming up with a01 (Water in the bottom, floading ), called engineer thay replaced the pumps and water level sensor, but this did not sove the problem had engineer out about 20 times in first year.

After the warranty ran out I had a go myself, watched it fill could not see a problem.

I reduced the water presure and leveled it up and had no more problems with A01

After 7 months of running well I have another problem the top section is not cleaning, I suspect that the plastic rotor is worn ?

I had it apart today and everything was clean (Inside pumps and pipes) , If i open it while its running there is plenty of hot water flowing , from top and bottom.