So far the consensus seems to be keep it. Other factors: 1) I am going to parent's place over christmas, so it's not going to get fixed. 2) I am moving house after christmas so it's not going to get fixed. 3) I will have lots of things to do on the house so it's not going to get fixed. Then, eventually it's a question of finding out what's wrong with it and fixing it. Easier said than done, and how many more times will it have to come apart to find out what's wrong? How many more times will I have to replace 9 output transistors because I didn't get it this time, at £22 and 4-6 hours work to replace them, not to mention the slow stripping of the through-hole plating of the circuit boards. Frankly, I am still not of a mind to spend any more time on it.