Hello. Is it possible to rebuild / transform a Neumann TLM 103 into a Neumann U87? I am a vocalist, and I am currently using the Neumann TLM 103, but unfortunately, I haven't taken good care of it over the years and I'm starting to hear static and high pitched frequencies and whistles that are looooong and squeaky. Even so, this is the best mic I have in my possession that make my vocals sound professional. I want to send it off to get repairs, but before I do, I wanted to know if it was possible to transform the mic into a more high quality one. If I can pay several hundred dollars for a transformation of a mic, I'd rather do that than pay a few thousand for a new one.... that is if it's possible to rebuild it for cheaper. BTW, I am no expert and I am really an artist. My apologies if the question is ridiculous. I don't know anything about the technicalities of this equipment.