I was working on a BMW radio with a strange problem A pop in audio when Vol,presets,AM/FM/WB but not mode are pressed or turned.
I removed the glue from around the crystal which was dark and hard, also there was an insulator under the crystal.
TWO days later, several other problems found but still a pop in the audio I decided to look under the insulator there was more glue but
it was soft and flexable but I removed it anyway and the audio pop was gone.
This is the first time I have seen this glue cause a problem when soft and flexable.
Jeff