Reserve light / Empty icon and reverse light not working

[RJ.Chev]

Hi guys,

I am struggling to figure this bugger out and would appreciate some help.
My petrol gauge works 100% but the icon when your car reaches reserve doesn't seem to light up.

I've removed the whole cluster, tested the small bulb by exchanging with the brights/ high beam icon and the bulb is not the problem. It is one of those that just turns in. Anyway this has not helped in any way. What else can I look at? Also experiencing problems with the reverse light. Bulb is fine, no blown fuse but doesn't turn on when putting car in reverse.