you mentioned that the car is still under starmark. in that case dont bother troubleshooting on your own just to go the dealer get a loaner and relax. let them figure this whole thing out. tell them you have a bad transmission and take it from there on. if one dealer doesnt help the situation go to another one. make use of starmark !
good luck.

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Whether you think you can or cannot, Either way you're right!. by Henry Ford.