I apologize for the previous expert's answer. I'm not sure exactly what water flow tubing IS - or WHY a bolt would be in it - however...
The brown stains are likely coming from the felt drum seal. The OEM adhesive is tar based - and after time and use - breaks down.
You'll need a new felt seal - and the adhesive that is used should be silicone based... eliminating the brown streaks.
Thanks for using FixYa
The drum is stainless steel.
Maybe a nut or bolt is in the water flow tubing that is giving off rust.
looks like you are going to have to take off some of the tubes inside and have a look to see if you can find anything amiss.
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