4.0GS400

Hey everyone, I'm a Lexus newb, just bought a 99 GS400 w/130K miles. Interior/paint are excellent, car runs like a charm except for small exhaust issue. Question is, Lexus can't verify any dealer service after 68K mi. Just changed the timing belt/serpentine belt/water pump to be safe and changed the oil. What other big maintenance items do I really need (brake fluid, AT fluid??) - trying to keep this car forever!