I've had my 2016 Mazda 6 Touring for 3-1/2 years. I know the noises the engine makes on acceleration, but recently it seems like there's a rumbling/resonance noise upon acceleration from a stop that is louder than I've ever noticed before. Even when cruising in Drive, if you back off the throttle a little at say 1,400 RPM and maybe 40 MPH, you can feel the resonance. The car has 27K miles on it. I plan to have a routine service done in a week or so at the dealer. Is there anything I should tell them to check specifically?