hi all, fairly new here. ive got a at trans temp light on. code is p1707. car runs, drives and shift fine. my mechanic went through the entire mitchell procedure and everything checked out ok. last option in mitchell was replace valve body. seems kind of drastic for a car with no shifting problems. wondering if a sensor is the cause. cant seem to find anything in google or any subaru forums. any hepl would be great..car has 104k if that makes a difference