Servowarm Elite 50 - tech query

I need to know an approximate date when parts for the ServoWarm Elite50 were discontinued. I am particularly interested in the rough dtae when the Gas valves for said boiler generally became unavailable.
TIA Flighty
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.