SteveCraig

The leak point is generally so small it's not visible & it's tucked up inside the upper shell of the shock. Tell tale sign is perhaps a tiny drop of fluid covering the bottom half. It will appear wet on visual inspection. Similar to a drop of oil or gas in a pool of water. Slick will travel quite a distance.
Unless you are seeing puddles on the ground where you park it, it's probably not a major issue. Ride quality may start to suffer if enough fluid is lost & the shock looses it's dampening ability.

canuck2s

Dealer told me left rear shock was leaking & needed replacement at 80k km (48k miles). Unfortunately, I am just out of warranty. Dealer quoted $150 to replace one and said the other did not need to be replaced. After reading these posts, I decided to take matters into my own hands to replace both. I did not order Lexus shocks (I don't want to do this again after only 80k km), but got a pair of KYB shocks ("lifetime warranty") from RockAuto for about $150 with shipping. I can confirm the install was pretty straight forward and took about an hour to do both. However, in my case, the upper bolts were pretty rusty (see pic with part number on bag), so I replaced them with new ones from a local Toyota dealer (apparently the part number for it is the same as the one on the Highlander).

Thanks to everyone for posting.

garygve

How does it ride with the KYBs are they softer or harder then the original shocks?

canuck2s

The KYB's are a little more firm than the OEM shocks. I noticed just a little more jarring over uneven pavement and maybe a little less body motion going around corners. However, they won't turn an RX into a road carving RC-F!