Cab light question

[JT_Trucks87]

I have 3 rigs with clearance lights on them. Two of which I have never had any issues with. My79 dually however has two lights dead in the water. Initially I thought it was just bulbs no big deal as all 5 were non op. Well I got 3 of them fixed with just bulbs but the two pictured did not come on with a bulb change. Any ideas? Do these sockets go bad? Are these lights wired in parallel? Any input would be greatly appreciated. I do have another harness that I could use but really don’t want to get into that if I don’t have too.