Could you get a video of her operating? The arm will always heat up if there is a disconnected wire (all of the Pleos I've had with loose wires have had this issue as well), but the leg should not be functioning correctly if that is the case. It could be possible that the wire is slightly out of place and still making contact but occasionally slipping and causing heat as well, but I've never heard of this happening before and this is just a guess. If it's a hot day out, Pleos can just heat up a fair amount in a short period of time, but it's odd for one leg to heat up and not the rest. It's possible that area could have heated up more if you were holding her with your hand there though. It's also normal for a Pleo's back to heat up, so if it was the back just above the shoulder and not the shoulder itself, that shouldn't be an issue.