My local parts supplier-restoration shop has had issue with the reproduction dome lights. He said it comes from them being Chromed plated inside and out. The originals were only Chromed outside.

I was ordering one when he told me this. He was going to tell me what he does to fix it but we got side tracked on other things. I'll ask him again when I see him to pick mine up.

He's seen several cars catch fire or do the melt down like yours. If your replacement is Chrome inside it will do it again.