Hey guys, I have a 2010 LR4 that's experiencing suspension woes. I've done some searching on the forum, and it appears there is a very common problem with the LR3 where the desiccant in the dryer assembly gets completely saturated and then breaks down over time, clogging the filter in the dryer assembly. I wasn't able to find much on the LR4 specifically, but I'm wondering if the vehicles are the same regarding the compressor issues and fixes. Can anyone help point me to the most helpful threads? I'll post back later today exactly what codes are being given as I had it in the shop to be diagnosed. I'd rather fix this myself and obtain a diagnostic tool for say, $700, then pay the dealer $1400. If money were to object, I'd happily pay the $1,400 Any help or direction is greatly appreciated.

Edit:
Vehicle has old-design AMK compressor and is giving code C1A20-64 "Pressure increases too slow when filling reservoir"