Best thing you can do for anything electrical is to ensure you're keeping water out of the vehicle. This includes:

- Cleaning/replacing sunroof drains front/rear
- Windshield trim piece
- A-pillar trim piece recall fix (can get it from the dealer or online I think)
- AC condensation tube cleaning

I think most of these are pretty well-documented. If you haven't checked these yet do it now before rainy season, otherwise you'll wake up to a bunch of water in the footwells drowning your electrical system. Happened to me. I bought my LR3 from a Jeep dealer, and two days after brining it home noticed my passenger carpet was wet. Had about an inch of water under there.