Regretfully I am having some of the same problems. No answers. However, concerning self-servicing your Lexus, I was told that the 15,000 mile checkup/oil change, etc, would cost me $365!!! at my local dealership. I'm not wealthy, I just enjoy a really nice vehicle such as the Lexus. I'm ordering oil filters, etc, on-line and will do some of the checkup-work myself. I thought I had paid a reasonable price for my RX-350, but it looks like the Lexus folks want a LOT more of my hard-earned money.
Sarge