Did the previous owner did the 90K service? Lexus service here does the following at 90K, and 120K miles:
Replace spark plugs, timing belt, water pump.
Replace oil and filter, air filter, cabin filter, A/T fluid, differential oil, brake fluid, coolant, fuel filter.
Rotate tires. Inspect brakes, sterring linkages, drive shaft boots, body chassis nuts and bolts, exhaust system, rack and piston assembly, fuel lines, connectors, fuel tank, vapor vent system. Check wheel alignment, balance wheels and tires.