VCU check

Hi all
Just to make sure that I am not going mad and think that my VCU is duff I decided to check it. It doesn't feel like I have a duff VCU while driving but want reassurance anyway.
Should the VCU be walm when driven for a bit? I went for a drive about 10 miles earlier then as soon as I pulled up went under car to check temp of VCU, I assume that if it was being worked would be walm. I could touch it no problem without any walmth really(pretty cold). Rear dif was walm but could touch with palm no problem.

Do the tippex test - or the "new" torque test.

My vcu working fine and gets warm when its been used.
Do the tipp-ex test.

I would need tipex for that, damn! Back to staples again I suppose.
Do you put it on the props or the actual VCU?

Use touch-up paint instead.
Put it on the props.
Search tipp-ex test for know-how.

Cheers guys!!!!
Will do tomorrow, again more brilliant info!!