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Swap the two kitchen circuits at the controller. (yes the switches will be wrong when you do that)
If the fault moves to the other set of lights, it's a fault on the controller. If the fault stays with the same set of lights, it's a wiring fault on those lights.
If the fault moves to the other set of lights, it's a fault on the controller. If the fault stays with the same set of lights, it's a wiring fault on those lights.