When testing the electricals after my marathon radiator fan fixing effort I discovered the number plate light didn’t work, so today I unscrewed the mounting for the rear light unit to test it and found that indeed the plate light didn’t work. I then disassembled everything to get the unit apart.
The indicator lenses have had mud in them for ages, which has been bugging me, so I thought before ordering new plate light I’d try and clean them, the idea being that if I broke anything I could add it to my order. Sure enough, when the lenses didn’t seem to want to twist off I tried prising them and they popped off easily - but with the cracking noise of breaking plastic. At first I thought they were glued in (as they are referred to as ‘sealed units’) but on closer inspection they are attached by bayonet fitting like tabs. The lenses are available as a separate item part so were added to the order.