Not sure how they can be repaired as they look to be sealed, maybe they can be bypassed which will only take away the warning light facility. Has anyone done this?
Looked a bit deeper and found it was a 3 amp fuse. Whilst at it I have cleaned up all the the connections on the fuses/fuse holder, lighting relay and all other relays.
I found a Company in the Netherlands that could supply one for €10 + €19 postage but the only way he would accept payment was by bank transfer so I declined doing this.