Breva 750 erratic speedo and a fueling question

I am selling my Breva 750 but I would like to sort out the speedometer, which has started to occasionally stop working. I suspect condensation/corrosion somewhere, is this a known issue?

Also, a potential buyer told me that the high pressure fuel lines sometimes need replacing. This is news to me and I can’t find any reference to it, has he been misinformed?

Speedo sender is in rear caliper bracket, they can suffer from water ingress. The high pressure rubber lines used on early Breva 750s can perish like any rubber line. I have not seen the later high pressure plastic lines degrade over time.

Brian