I was never good at that game, can't tell anything. But here's a pic of the rear right corner of the cassette. You can see the hose opening there. In my case that whole black plastic thing area and in front of it for a few cm was completely clogged with Autumn debris
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'05 E53 X5 3.0 6mt. Sterling gray metallic / black. 130k
'17 F30 340ix 6mt. Black sapphire metallic / black. 80k
'96 E36 328is 5mt. Alpine white / grey. 150k
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