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You're supposed to push the even buttons (the 2nd, the 4th and so on).
There are clues for this puzzle on the theater (requires night vision; it may not appear very well in certain video modes) and on the "graffiti" on the front street.

Hope i helped...

  Thanks!

I'm not sure if anybody noticed, but there is a small text on that Lunar Apocalypse poster in E3L6. I could understand part of the text: It begins with "all work and no play makes duke a dull boy" and it ends with "sea shells by the sea shore.", but i can't understand what's in between...

If anyone with a better eye than mine could help, i would be very thankful...

P.S: Apologies for my poor English in any case...