Servicing/Repair of a 1992 R100GS Ignition/Light Switch

I'm having intermittent lighting issues and believe I've narrowed it down to the lighting contacts on the ignition switch. This switch is no longer being made and I have yet to locate a new or used replacement. Does anyone have any experience in servicing the contacts/mechanism in this switch? Also, I'm not finding any information on how to pull the switch apart, so guidance/tips would be appreciated.
Thx
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