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Originally posted by Suicide Junkie:
Also, be wary of upgrading a space factory!

Since you have a spaceyard on the base, you are allowed to retrofit, but when you upgrade the yard component, it will start out broken and unable to repair itself!

I did that once, and had to send a repair ship halfway across the galaxy

Except if your Yards also have Repair bay... But in this case beware of upgrading simultaneously the yard AND the bay !!!