Iridescent lines inside lens - fungus?

Photo: https://imgur.com/a/aF49RTk

I've been a terrible photographer and haven't touched my kit in a few months. Yesterday I decided to go out and shoot since I happened to wake up early and there was some nice moody weather around sunrise.

When I got back I happened to look at my lens (Fuji GF 32-64) and noticed what looked like very thin copper-y like iridescent lines at different levels inside the lens. I've never seen anything like it before. The only thing I can think of is that it's a fungal colony, but I haven't been able to come across any photos of anything like this on other lenses. I'll be dropping the lens off to Fuji's service center in Edison, NJ this week or next. My question is: has anybody seen anything like this before?

The lines themselves don't move when zooming so they're not hair or anything else affected by air movement. They all seem to be internal to the lens - it's not a scratch on the outer side of the front or rear element. (And there are three of them at various depths inside the lens.) To me it looks like individual strands of thin copper wire, but I know that this isn't anything that would normally be found inside a lens.

I normally store my lenses inside a Shimoda backpack with my camera and other stuff in my office. I live in NJ so it's humid in the summer, but I have air conditioning so it's never a swamp or anything. I have two vintage Pentax 645 lenses on adapters in the same bag and neither of them have fungus, so whatever this is, it's isolated to this one particular lens.