Easy as mate,pull out rad and send to a radiator shop and get a service done.New oring and top tank if the fitting is at all discoloured,most likey find its bubbling on the inside.
Unless the finning is going or its got alot of internal corrosion theres no reason it wont see another day.
yep sure is,but it probably will have a lexus price tag so take your cheque book.Should cost around the $200- $250 mark for the service and tank etc,thats would i would charge someone anyway.