Also, the fake plastic vines usually have "bendy" wire in them. He may have climbed on them enough to have exposed a piece of wire somewhere. I would examine the vine closely. Also, some of those vines come with suction cups that stick to the side of the viv to suspend the vines from little metal hooks. If you are using those, he could be scraping on the metal hooks when climbing. They can sometimes have an abrasive edge.
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