I'm not sure a structural fix is needed here. It appears that EU law already requires unbundling service from sales in cases like this, and requires that necess

I'm not sure a structural fix is needed here. It appears that EU law already requires unbundling service from sales in cases like this, and requires that necessary documentation is made available for third-party repair shops. Sabotaging public transit infrastructure is surely a crime in Poland, and I suspect it won't be hard for the authorities to prove that was what happened here. Sometimes people do things even when those things are illegal. All that's left to do at that point is prosecute them.