Hello! This is my first post so sorry if I seem new to this. I was adjusting my seat in my 1998 LS400 and I heard a thump and hiss sound and the middle cushion collapsed as the air leaked out. Does anyone have any info on what that was? I’ve looked it up and haven’t found anything about it.

thanks!

 

The seat does not have any air bladders as far as I am aware

This is slightly different because it's 1995-1997, but please see the attached images of the lower seat frame

There are some springs, and the plate in which the seat foam and then seat cover rest on top of

Sources:
https://www.ebay.com/itm/204758500092