Swift solar panel

I have a 2015 swift elegance which has a factory fitted Sargent solar panel.I have recently found that water is running into the van via the solar panel connecting cable.The cable from the panel enters the mounting through a gland approximately 1 inch above the roof so I have to assume that the water is entering via the bonding panel to mount or the bonding mount to roof.Inspection leads me to believe that the fault is most likely panel to mounting.....has anybody else had this problem?(Sargent say contact Swift!!!)