This looks to me like the RAM is not properly seated. I can’t speak for this particular model, but I’ve seen cases where putting light pressure on one side of a laptop was enough to cause this because the chips were loose in their sockets. Maybe try removing the bottom cover and slightly wigglig them to see if you can reproduce it. I’ve fixed it on some Thinkpad models by placing a thin piece of rubber between the RAM and the mainboard to hold it in place.