2015 S550 PSE Dynamic Seats Error
 

Hello. Thanks in advance for any help. I have a s550 which at 21k miles the dynamic seats as well as massage functions do not work. The truck, locks and power does assist work fine. Bought a ODB tool and the message simply stated pnematic pump. I found the part on ebay and was thinking of replacing my self.

Dealer mentioned only could get part from the deal, only the dealer could reprogram and costs ~1,500. Too much for me so want to try myself.

Thoughts?