So your car hasn't seen a garage/spanner in the last 3 years?
I'd get a full service done: which is: New: oil, air filter, oil filter, pollen filter, coolant, brake fluid, diff oil, spark plugs. Also at that age I'd get the timing belt (with idler and tensioner) replaced. Its also a good idea to replace the waterpump at the same time.
I'd source the replacement parts from Toyota/Lexus and find a good local garage to fit the parts (A Lexus service stamp in the service book is not going to add much value to your car now given its age).