Well, to close this story at last: I had a lengthy email exchange with Rob Schofield in which he agreed to send me the fuse, and also some screws for the drive tray mounts and a pair of handle springs. Then it emerged we were just five minutes apart, so he did all the fitting for me.

He's done a fantastic job, and in passing cured the sticky buttons which were being a nuisance, and now my player is as good as new (well, better, due to the illuminated LEDS that started the whole saga).

A public "thank you" to Rob, and a strong recommendation!