So rear wiper was leaking, found the "how to" replace the washer with a better washer, leak fixed.
BUT first wipe worked, but now it is just going though the random cycle and parking anywhere on the window.
Have found out about the magnet but I have not needed to change the main drive wheel so should still be in there (don't know were it is located).
Could I have put the wheel in the wrong position, or any other suggestions?
Thanks