Guitar trouble shoot: Make sure you grab all ammo boxes during all encounters and waste them. I noticed even if you grab some ammo boxes will appear after as well. Elevator uneven float: make sure not to bump anything on the way down or it will cause someone to stay afloat longer Blueberry with a few people see others invisible. Have host/chosen one and the people who see the invisible leave and rejoin. Worked for us. Just a few ways we were able to get our Petra’s run done. Hopefully this helps others