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Absolutely no knowledge but a seal going on a fairly new washing machine does seem odd. I'm basing this on only one of my rented houses/flats ever having a new washing machine and none of the old ones leaking. Have you contacted Seimens?
I watched this:
https://www.youtube.com/watch?v=YqY6Tklb8vc
Which seems simple enough.
My two main concerns would be; 1) ripping the new seal (or fucking one of those string things) and 2) cheapo rusted bolts being a pig to remove. So as long as you're prepared to spend the money on two seals and someone to fit them, I'd have a crack.
Would I be foolish to attempt to change the door seal on a (3 year old) Seimens washing machine? YT videos look a bit complex but we called someone and they started saying the seal is 'unusual' and would be £120, when all the evidence is to the contrary and £60