Solid front left indicator on 2000 CL500

[Coops74]

I've finally got my CL500 running running again after being sat in the garage since before Christmas. I've just noticed that the front left indicator is on solid (not flashing) even with the key out and the car locked up. I'm struggling to think where to look.

Any help appreciated...

 

[Iceviolet]

Could be a sticky relay, I would start there.
Also check all terminals from the lamp holder back for corrosion/damage also.