I’ve taken it apart now - I honestly think the connecter’s buggered, Jim.If you can disconnect the hot line further back, do it and connect a water line or compressed air line (like a tyre inflator). The higher pressure should seal the leak and then you can connect the hot water line back again.
A motorhome hot water line is usually a slightly lower pressure and you need a bit of pressure to make a seal.
I’d rather put my faith in new hose & connectors. Don’t want to be worrying about them all the time.I had to cut my hose back a bit to seal