It looks like you have the AMK replacement compressor for the original Hitachi.
There are some parts available for the older Hitachi which was OEM on the 2005 to about 2010 vehicles, but the newer AMK, I have not heard of any parts yet being available.
That does not mean there are no parts available somewhere; just that I have not heard or read of anyone yet fixing the AMK. The longer the AMK is in service, the better the older Hitachi looks.
You might contact Arnott Air Suspension Products per below as they do know compressors; the AMK for Land Rover in particular per the 2008 product link below.
www.arnottinc.com 1 800 251 8993
https://www.arnottcanada.com/landrover-lr3discovery3-2008-air-suspension-products.aspx