Backbox illumination
There had obviously been a problem in the past with the backbox illumination. Comparing the wire-loom with how it should look shows that over half of the bulbs are missing and that the loom has be divided into two separate parts with two plugs/sockets and the plug on the cable loom to the powerboard has seen better days!
How the backbox lighting looks
How the backbox lighting should look
The two connector solution
The corresponding two sockets on the connecting loom
This will definitely need replacing!