I'd be surprised if the water pump hasn't been done already as they have about 10 years in them before they go, if not it probably wont be long until you hear it if it's not been done. They are a fixed price at Lexus and it's worth going there to get it done. To my knowledge you get new coolant added at the same time. Spark plugs to be honest I wouldnt bother with they will be fine and it's a big expense to get them done. I would however look at the brake calipers on these as they are a known issue and seize up. The slide pins need regular greasing and Lexus dont do it. Simple to do yourself though or a trusted mechanic. You should get many more miles of motoring out of it they are fantastic cars. Sent from my SM-A505FN using Tapatalk