According to google my MW512 is suffering fault 130.
I dropped the rotor and stator to check for corrosion on the RPS terminals but it all looks ok so I'm guessing the RPS needs replacing.
What do these cost in NZ?
About $30 to $35 NZ. Can't give you an exact price or part number because there are several different RPS. Is it a white one or black one? Or tell me the product 5 digit number off the label at the rear and I can look it up.