DearAVL940T,

Hope you're well and stay so! The first, low-cost option is based on the lower lights in each cluster not working, while everything else (reverse and turn signals) does work.

So, I'd remove both clusters and clean all electrical contacts - on the cluster bodies and on the bulb-holders - with an aerosol corrosion-remover (e.g., Deoxit).

Coat contacts with di-electric grease, and re-assemble. An invisibly-thin layer of corrosion - perhaps only a few molecules thick - can disrupt a circuit. Deoxit will remove that corrosion.

I suggest this approach, because the car has been idled. Corrosion can form quickly, especially if the car lives in a humid area.

Hope this helps.

Yours faithfully,

Spook