Ok I will tell him all this , thanksNot certain on the l322. On the p38 it's a replacement job and I would suspect the same for the l322.
You could try disconnecting the actuating arms and moving them throughout their travels a good few times and hope they clean up but there is a risk you make it worse.
As said before, with the correct diagnostics you should be able to see live readings from them and see what they are doing.