4yr/50,000mi warranty expiring soon. What should I check?

[Edszhi1]

We've had this wonderful i3s (no REX) for nearly 4 years, and 30,000miles already. From our experience with our 2014 i3REX we know that the boots over the struts are at risk for cracking and decomposing leading to a very expensive repair bill (see attached photo.) Are there any other things I should look at before the 4 year/50,000 mile warranty goes poof? Thank you.