Mine went there too,not sure it`s fixable ? My connector was dripping,so i gave it a little twist,made it 100x worse,the connector is connected to a little copper pipe,this goes through the plastic jacket,through the silicone,then into the copper tank where the element is.
Mine had been leaking inside the jacket,and eventually tripped the power off ,as it had worked it`s way up to the lec bit`s at the top.
Could try to solder it i suppose,getting into the dam thing though,was told to chuck mine out,got another from Woodbridge,about £100 cheaper than Prochem