I am trying to replace a fried lamp in my very old amplifier (a Dual CV 1280 Integrated). As I essentially only use the mode that is indicated by the fried lamp, I thought I could just switch it with a working one. However I have no idea how to get it out. Can anyone enlighten me? I don't even know how they are called, hence no idea what to google. It only says Osram 24/1.2
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Photos from front and back (the grey thingies):