If you really want your courtesy lights to work, then I would replace that switch. Unfortunately Subaru does not show any available at this time, and even if they did the list price is about $100. So, I would check around for a used one if I were you.
As far as the shifter light, I've had a couple that had burnt bulbs but I'm not familiar with it sometimes working and sometimes not. Sounds like a loose wire.
Dave
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