W124 reg plate lights - '88 230 te

hi just lost both number plate lights and trying to trace the wiring
Haynes manual shows both wires going to a 'light control unit' - is this
either (which?) of the relays under the fuseboard?
If its just the wire(s?) cracked at the gate hinge does anyone have any advice re repairs e.g. gotchas with interior lining, wiring, getting it watertight afterwards etc
thanks in advance
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