Hi Red Rubi. I'll bet each of the 3 lenses 'pops' into the black surround, that is attached by 2 srews into the caravan wall. the screws will be hidden while the lenses are in place. On my lights (a bit different, and made by Brytec, but close enough)there are two little projections on the top and bottom horizontal surfaces of each lens. These projections click into equivalent recesses in the mounting frame itself. If you get two thin-bladed screwdrivers, insert between the mounting and the lens on the top of the lens (to start) and lever out gently - but it may take a few goes. Once the top is free or has moved, at least, do the same on the bottom of the lens. Be careful you do not break the eletrical connections as the lens comes out. If they refuse to budge, it is likely that whatever sealant was used to waterproof the hole for the wires coming out of the caravan has spread to the back of the lenses. This may prevent the lenses coming out cleanly, especially if sikaflex sealant was used. In my case, we had to saw through the sealant carefully, avoiding cutting the electrical connections, with a thin flexible serrated kitchen knife - not a lot of fun! Had to do this with lights on both sides of my van when the original lights became dodgy. If you are lucky enough to pop out the dodgy lens intact,take a photo of the eletrical wiring connections before you cut them as close to the lens as possible, so that there is sufficient length to reconnect them to a new lens. Then you may need to take the old lens to your nearest auto-electrician or auto parts shop to see if they can supply an identical replacement. In our case, we had to buy two new complete light units, at about $100 each, and start from scratch, being careful to reseal the hole into the caravan, but NOT with sikaflex (a silicone gel ought to do the job)!! Best of luck.... Mike