What are the wear signs that indicate the accumulators and/or the shocks are in need of replacement? With the suspension system being a closed system, how often does new fluid need to be added and why? Does the system ever need to be flushed and new fluid added?

At one point, someone in a thread mentioned that the membranes might be dissolved in the accumulators and would need to be replaced. What are the signs that this is necessary?

 

Please go to 'activesuspensionsystems.com' and read a lot more about the AHC and suspension system on your LX-470.
When the ride starts getting 'bouncy' and choppy instead of smoothly damped, its time to replace the accumulators. The 'shocks' last forever, cause you renew the fluid when you replace the accumulators.