How important is it to change the transmission fluid at 50,000 miles? Is there a way to look at the fluid to see how dirty it might be without pulling the main plug? The Toyota dealer quoted me $155.00. Is this a fair price? I would prefer to take it there instead of the many small shops in my area that normally don't work on hybrids. I have never had a mechanical problem with the car or transmission. It's a smooth running machine and the most trusting reliable car I own compared to my other non-toyota cars.