Newell Gurus

Is there a rebuild kit for these? I would rather keep the original than fit an AD-9. The bottom gaskets have some air leaks. I have been going around with bubble soap finding many leaks. My front Aux compressor went from running every 7 min to 25min. I have three decent leaks discovered that will bring that time distance a little better. In my quest I discovered the air dryer leak. I have looked online to no avail. Maybe someone knows of a site?
Thank you!

My 316 has that unit. My truck service center says they are not serviceable. I see no reason that it could not be disassembled and cleaned if needed. Gaskets can be made if needed. So far mine has worked flawlessly.

I did find a lower rebuild kit on eBay. Although I bought it, I am most likely going to replace it with the AD-9 unit. Really didn't want to retrofit anything but hate dealing with obsolete parts. I have had the new AD-9 sitting in a box from a previous bus conversion project.