Diff locks color tubing decoded.

[Louis-Alain Richard]

I played with a rotary switch from a 4000Q and I think I found the
function of all the color tubes:


5 tubes switch:
White: vacuum from the engine
Blue: rear unlock
Yellow: rear lock
Orange: front unlock
Green: front lock


3 tubes switch:
White: vacuum from the engine
Red: unlock both diffs
Green: lock both diffs


If someone can confirm, then it could be added to the wiki KB as a data
point. 

Louis-Alain