ADBLUE FLOWING OUT THE PLUG? TERMINALS CORRODED?
Well, now you can buy the metal contact track to fix it all! 
Please be aware this isn't a simple swap as you will need to remove the factory track and re-work this into the adblue module, I glue and bolt this in as a replacement, turning an adblue module that is deemed scrap into a unit that will be perfectly serviceable with some other components such as a seal kit or a new urea pump