Just for sake of variety (plus I like the number 42 
), here is my solution, starting with the RED lever to change a little.
(It’s my first post so don’t hesitate to comment for improvements as well).
http://www.lodev.org/jstumble/?board=00llllr1r1eerbgbgbeexbxeelxlrellxerrrlrellxxlliliriee
