If they did diff bushes they've had the
irs out. Your problem is the
irs unit hasn't been put back in straight. Don't get a wheel alignment done. Take it back to the dealer and tell them to align the
irs unit. If they look at you stupid find another dealer.
You can check for yourself if you want to stick your head under the back of it. Right at the back where the
irs unit mounts to the body is the alignment holes. One is round and the other side is oval and about 1-2 inches in diameter right near the rear 18mm mounting bolts on the left and right hand sides. Also check for witness marks around the mounting nuts. If you can see witness marks around the 18mm mounting nuts then it hasn't been put back in the same spot and will be out.