So I have a J47a that I love dearly. It died however, after sitting cold stored (-40s) for about a month in Resolute Bay, then flew here in an unpressurized twin otter. Now I am wondering what killed the mic; Cold (electrolytic capacitor???) or altitude (lack of pressure), or both? I would really like to get this mic back up and running. XLR and all is fine. Gained/levels up all the way if i really tap the housing i get a faint sound... I just want to know where to start on this mic. Suggestions would be appreciated.