Time for a valve job?

[danmic]

Hallo sir's.

So, this sommer i bought a xt 600 03. 24000km.
It runs and starts good.

I was doing a little services and one thing went to another.
I took the carbs off, to clean them and notice that the intake valve on the right hand side, secondary carb, was kind of dirty.
https://www.dropbox.com/s/0ceufgwl06...03754.jpg?dl=0

Compared to the lefthand, primari carb valve.
https://www.dropbox.com/s/3mhtnwgnf8...03746.jpg?dl=0

I can't deside if this is sign of a leaky valve or just olie from the airbox junking up on the valve pind.
When i took the airbox apart there was quite a bit of oile the airbox. Most of it, in the righthand side.

What does the gure's think.
Shoud i take the top off and relap the valves.

Best regarts.