I have a 2010 Mercury Milan premier which has begun having what feels like rough downshifting/up-shifting issues. Each time it happened The "wrench indicator light " has come on.. It has only occurred at low speeds (in town driving). highway OK. I can reset the light and problem by placing in park and restarting. I own the car and would like to keep it but only if I'm not going to get hit with a large bill. otherwise thinking of trading in. don't want to sell private as I don't want to saddle someone with a car with a big problem. Any insights/recommendations would be appreciated