Where can I find information on having LCN door closers rebuilt?

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The maximum recommended door weight for LCN closers is 225 lbs.
The fluid in an LCN closer must not be refilled in the field. See attached Warranty and Repair Communication 
The LCN closer fluid "Liquid X" will perform without variation between:  -30° F to +120° F - for manual closers.  +35° F to +120° F - for electrical closers and automatic operators. At around ...
LCN does not offer any products for sliding doors.
The LCN 6030 is a Double Acting (or dual action) closer. Requires a "Cased Open Frame" - that means no stops formed in the frame.