Agreed, sounds like main relay. I had this on my 916 - intermittent but total electrical failure, usually when first switching on the ignition.
On my Monster (and 916) it is a yellow relay, not your standard changeover relay as it has two NO contacts rather than a NO/NC but they are (probably) available from motor factors and online as well as Ducati though not as common as the normal changeover relay.
Best buy two so you have a spare...
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M900, 916, LeMans II.
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