Thank you, gentlemen. I now have a cunning plan. The SE in question is a FDHD, so given what has been said, all should be well.

What I'll do along the way is deal with the rather badly yellowed plastics as in this thread, so as to produce not only a working SE, but an attractive one. At the present moment, it looks like it's been soaked in urine since manufacture. Not a pleasant thought.