Anybody out there know where to purchase a replacement switch for the one just left of the door. It has three modes, off, dim blue light for night & on for bright.

Andre

Similar, but not quite the same

https://www.caravansplus.com.au/coast-teardrop-grab-handle-with-led-light-p-22081.html

Or this looks the same as yours. 

https://ourvanrv.com.au/products/1-x-new-camec-led-grab-handle-light-white-bargman-caravan-041480

Or a chrome version for less.

https://www.outbackequipment.com.au/camec-led-grab-handle-chrome-with-blue-night-light