Double check the windscreen washer tubing behind the dash. If its the black rubber perishable type as fitted originally, replace it NOW with neoprene tubing (that is durable and long lasting).. To do this there are three screws to remove to lower the dash, but you will first have to lower the steering column to its lowest setting and of course the plastic moulding behind the steering wheel. Why MMC chose to use cheap rubber tubing in the first place heaven only knows !!! - It leaks sooner rather than later and can cost you an arm and a leg when water leaks down onto the circuit board.
