I bought a 2006 GX 470 and the amplifier is bad. My mechanic can get one on line for $700. The dealership wants $1500. Minimum. I can't believe with all I've read about the bad amplifiers that Lexus hasn't done a recall or there hasn't been a class action suit. Can anyone please help me regarding this matter? There must be a cheaper fix! I'm also in need of all the manuals that should have come with this vehicle! The car dealership still has been No help after many promises! Any help you may give regarding these matters would be greatly appreciated!