unfortunately your best bet is to have a rod builder remove and redo the guides. Many manufacturers don't seal the guides in properly, which allows the guides to corrode.

 

Are you sure the wrapping finish hasn't ambered on you from the sun? One of my personal customs builds looked like that till I looked at the finish sealing the guide tunnels and the heavier blub sealing the tunnel near the ceramic ring was also ambered. Been using that rod pretty regular since 1985.

 

No, I'm not sure. It was hard to get a good picture inside, if you need better, I will take pictures outside with better light.

 

Filing a SS guide will remove the coating and when (not if) saltwater gets under the epoxy, corrosion will result.
When filing guides, redcoat with fingernail polish if you must file.
Or use titanium guides.
SS quality varies between guide makers. SS will corrode, just slower than steel. Higher grades/better quality SS corrodes less than the cheapest stuff.

 

Looks like ambering of the finish to me, that said unless the thread fails the guide foot will last as long as you will need it to, like my rod mentioned before near 40 years and counting on black Fuji SV double foots. Like aluminum, the nickel mixed in the stainless will display an oxide coating that may take away from the appearance but also creats a barrier to further damage. What do we use as fasteners, rails, boxes, hinges, etc. on our boats, naval ships, etc.