orangemirrors, ? that's original!
I'm pleased you found my experience to be useful, I felt just as you did when it first happened. I phoned Yamaha last Monday and spoke to their service manager, David Hunt, who made it clear they are aware of the problem. He advised me to use the links, which I received Wednesday, and they have solved the problem. But he did say that long term it is worth taking the amp to a Yamaha dealer and having the pre-amp phono inputs replaced free of charge. The older ones have a switch that is prone to sticking and they have more robust switches in the replacement sockets. You can do a fixit yourself by inserting phono plugs into the left pre-amp in and out sockets, but the links look better. If you are like me then you will be looking to chnage your amp in the not too distant future!
Good luck anyway!