Advice needed, I have a fiat Ducato base 2014, and the water in diesel filter light has come on. Only done about 600 miles since we bought it? . Been looking around on internet for info. I have found the filter it's in a metal case , at the bottom is an electric plug with wires on it. I think I should disconnect this plug then unscrew the plug thus releasing the water. Can anyone tell me if this is correct.thanks in advance