Hi Everyone - my mechanic is a nice guy but older. I told him not to change the tranny fluid with the 90k service and I think his assistant or someone did it anyway...I’m not pissed about the money. I’m more concerned with what changing the tranny fluid when Mazda says you don’t need to will do to the tranny. Just for fun, I felt it slip a little when I drove it home. Just once though. Then it seemed to work fine..I’m pissed. Help?