Ahh - will give that a shot asap. Having a 124 to 125 short ... likely to damage the chip? Or just stop it working until the short is gone?

(please say it's non fatal)

And I'll have to look closely at my backup machine - it's a mark2 not a 2a, and the last time it had anything done was a long time ago - maybe fun to listen to some stuff that's on it...I went through a phase of deleting things, before realising large disks were a better solution.