I had leaks from two of the three camshaft seals. This was found at the first, 1000 mile service. MMC provided my dealer with a pre-assembled cam set already fitted to the front supporting cover. It was therefore a quick replacement job.
Richard
2018 Roadster 3.7 1966 Land Rover S2a 88 2024 Royal Enfield Guerrilla 450 1945 Guzzi Airone