So I screwed up, plain and simple! I ran a #4 aluminum from a 200A main breaker meter socket with feed through lugs. That is the main service outside the home owners house. I ran the #4 aluminum from the 200 amp main breaker service outside into the new 200A service inside the house along with the 4/0 - 2/0 - 4/0 aluminum. I know it should be a #2 aluminum for the ground. The 2" PVC that is ran from the outside service to the sub panel in the house is not possible to get to anymore and there's no way to pull the #2 aluminum in that 2" pipe. I do have the re-bar inside the house grounded to the panel but I still have the #4 aluminum issue that should be #2. Any ideas how I fix this?