My two breaklights recently went together, 1 of them being the LED across the back window,i got the other one fixed easily but l was told l couldnt replace the LED.. is this true?

Renault dealers are in many towns, but if you go tone of these it will be costly, get advice from them, and then use a local garage.

It is true you can only buy the high level brake light unit.
It is a sealed unit and so the led is cannot be purchased seperately from a dealer. It does come seperately from the spoiler.

You may be able to get the unit apart and replace the led is with new ones if you can match them up at a local electronics shop.