Centre diff light gone out.
 

Hiya guys,I just have a quick one.
I noticed today the bottom light when the diff is in diff free mode has gone out.
The rest come on when moving it up and down and the centre diff is working as normal.
I just wondered if it's just a bulb or whether it's trying to tell me something.
It's a version 5 type R my99.

Thanks in advance for any help.

Danny.