I had a bad experience taking my Lexus to their se...

I had a bad experience taking my Lexus to their service center recently. After 2 hours wait and $135 spent for the "diagnostic" I was told that they're unable to verify what's causing the vibration, saying that it may be coming from the driveshaft and they quote: "would start replacing rubber coupler and see what happens " - which is $800 parts + labor. Few days later I realized that the vibration appears even when car is not moving and in P position , which only ruins their conclusions. Very disappointed by spending money and time with 0 result