What happened to some of the discussions?

It's been a long time since I visited, but lately I've looking for answers to some Legacy SDA SRS questions. Funny thing, I found some discussions that are helpful the last few days and then "Nothin' up my sleeve, Presto" they're just gone, just like that. Anyone know why? here is an example (https://forum.polkaudio.com/discussion/73796/sda-polyswitches-are-nasty). Fortunately, I've been converting some of the discussions to PDFs.

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