TU56 lamp replacement

[Tony Duell]

> 
> 
> > I guess I am the only person here who _repairs_ fans. I've been known to 
> > rewind the stator, and replace components on the control PCB. 
> Oh! What about the bearings?!? That's the most usual source of failure...

Well, if they're ball races, I'll replace them (they are almost certainly 
going to be a standard size). If bushes, well, I'll take a bit of phosphor 
broze rod and a lathe...

Perhaps I've been lucky, but I've not had much trouble with the bearings 
in the fans of _classic_ computers. Modern PCs are another story...

-tony