Identify push button from some Sony Video Console Thingy

[Hole]

Hi!

I rescued some parts from a non working Sony Video Mixer Board. These are illuminated push buttons, I assume two-color. I desoldered one button and looked a bit into the schematic, see attached images. As far as I see everything is multiplexed.

Resistor on board is 15 ohms, so I tried it with 1k. Adding 5 V nothing happend, adding 12 V it glowed some time and then it died. 

I don't want to kill more of those button for experiments.... Anyone out there to identify this push button and some data how to use it?

Thanks!