Yes disconnect lights one at a time as close to bulb as possible ran till a
fuse blows, if it does not with eater only on, then you have an over
current situation or maybe a very low tolerance fuse. If either fixes it and
you can pin it down by swapping, the junk the doff one and get another, if
it still trips with no bulbs the short is in the wiring, probably where its
bent or trapped somewhere by the boot lid.
Its not rocket science.
Brian

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The Sofa of Brian Gaff...

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BMW 7 Series 3 years old. Has tw lights in the boot. One under the parcel
shelf and one in the lid. No sign of water ingress. Very strange. Any
bright ideas out there (excuse the pun)