The 12volt light above the bed on our 2015 Troll stopped working, only the blue ring lit up.
Looking on auction site and caravan accessory shop I can get two for around £20.0 not exactly the same as the one fitted but good enough.
just for the sake of it I emailed a dealer in Cumbria to ask the price of the Hymer replacement light and got a shock, £48 .99 they want plus £10 postage
Guess which one i will go for.