Microphone fried from sauna, can it be repaired?

As the title states I use my WF-1000XM4 when I workout & in the sauna afterwards that is pretty hot, up towards 100 degrees celsius for 10-40 minutes. Pretty soon I started to use them in the sauna the microphone started to break down. Everything else works fine after almost two years of use in the sauna. The microphone controller seems to work since people can hear me only very, very low. I believe that the receptors needs to be replaced, cleaned or something else and thus my question. Do anyone have any experience repairing the parts of the microphone in these headphones? Thanks in advance.