In my 4Motion T5 the left rear shocker was leaking and was replaced under the warranty. They were Monroe made in Belgium. Later I've replaced both of them with Pedders HD shocks and King Springs. I can't complain, now almost at 100,000km and 7 years later, even on a bit rough road I'm happy with the ride. Tyres pumped to 51PSI at all the time.
Check the shocks for any sign of oil leak on them, you will see it as a wet patch at early stage.