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.
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...