 It can be top end. It can be bottom end. They had some problems with those, the early ones anyway. So, you know, he's out of warranty now. So, you know, standard diagnosis is going to be required. Stethoscope, try and do a cylinder balance. Does it change doing a cylinder balance test when it drops one cylinder or the other? Does it, you know, might show you, point you to a rod bearing issue? I would definitely do an oil analysis the next time he changes oil. Does it?