Get it done now , it will save you in the long run thats true , the techinician wont have to go back in , saves time for him so he can charge less. Most dealers dont try and rip you off. The technician looks at the car , if theres something wrong with it , or he sees a problem that will become worse , yes .. he wants to get paid to fix it , but if a technician diagnoses something that isnt wrong.. you have every right to ask for the old parts back and call him on it. I am the assistant parts manager at a toyota dealership and i can tell you all of our techs are honest. I cant say that for any other dealers , but our guys dont suggest it unless it needs it . And as for SHO, they didnt cover it because if they replaced it under warranty and toyota called for the parts back , which they do sometimes , the dealer wouldnt have gotten paid a dime for the repair. That is why they wouldnt cover it , the way warranty works is if there is a defective part.. theyll replace it , if it looks like customer abuse they play it by ear and call toyota to ask if they can cover it , they can also do whats called a "goodwill" if the customer comes to thier dealer for all of thier work and maintenance they can warranty it through toyota no questions asked. Im guessing for yours thier not trying to rip you off , but for some reason thier service dept doesnt want to try and get toyota to pay for it because they dont think toyota will pay the claim. sorry for the long post , just trying to clear things up from a dealers point.