what is in an L series Maintenance kit

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 Mounting Posts   Part Number  Door Thickness  L583-211  1 3/8"  L583-212  1 3/4" - See note section on SL1 trim  L583-213  2...
See descriptions for the 09-992 thru 09-997 parts kits for modular mortise cylinders.  The 09-998 is a kit for a rim cylinder.      
The current tools, pinning kits and key originating machines for all Schlage Everest full size cylinders and small format cores are the same used on Everest 29.
A service kit is available, part number 40-223.  Product description available HERE. 
The maintenance kit looks like a tackle box containing many service parts for the L9000, see list of components here.
Von Duprin has a maintenance kit part number 050046-00 and maintenance instruction, part number 941079-00 for 98/99 series devices. There are some common parts between 98/99 series and 22...