This auction is for a Pug 807 / Citroen C8 sliding door ECU which should also fit a Ulysse.
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=120718787980&ssPageName=STRK:MESELX:IT
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=120718787980&ssPageName=STRK:MESELX:IT
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