Should you correct production mistakes?

When you are cleaning up and restoring a piece of classic computer hardware, would you correct any minor mistakes made in the original production? I have a particular exmaple in mind. In bits on myu bench at the moment is an HP2623 graphics terminal This was HP's response to the well-knwon Tektronix terminals, it is, however a raster scanned device. But it has a little state machine (or parhapes you could call it a very simple procesosr) to speed up line drawing. But wanyway... On the video monitor PCB (HP call it the 'Sweep' PCB), there is a 74LS221 dual monostable chip in the common HP horixontal drive circuit, The first half of the chip delays the sync pulse (and the delay time is controlled by the horizontal centering control), the second half is triggered from that and provides a pulse of known width to the horizontal drive transistor. But I digress. You don't need to know any of that... WHile cleaning the dirt off this PCB (HV attracts dust electrostatcally, of couse), I noticed that the ground pin of this IC never made it through the board. It's folded under the package, but has been effectively surface-mount soldered to the pad when the board was wave-soldered. It works, but I can't beeleive it's as good as a proper through-hole connection, and it's certian;y not what was intended. I could trivially desolder the IC, straighten the pin, and solder it back properly. But should I? What would others do? -tony