The house I’m working on is over 100 years old. The main and sub are all BX/AC cable. I ran 2 dedicated lines with AC cable. Everything is testing proper ground. The one thing I noticed and am not sure is in violation is there is an aluminum bond jumper from neutral to panel back in the sub panel. I know ground and neutral should not be bonded after main disconnect. But since there are no ground wires or ground bus is that okay?