Paint peeling from Hardtop lights

[todc]

I am looking at a 3600 Open that has paint peeling from the round lights shining down in the hardtop. The metal surface appears to be bronze. No corrosion is evident visually. There is also a place where the headliner in the hardtop has come unglued for a few inches. Anyone have thoughts about the cause of this? I'm not worried about fixing these items but I am worried about the underlying cause.