freejung - 4:24 pm on Feb 16, 2011 (gmt 0)

You could do a lot of damage to your site trying to "fix" things that didn't need any fixing.

OK, then only make changes that would be good for your site regardless of their effect on your rankings. That's a good rule of thumb in any case.

For example, remove broken links and links to spammy and low-quality sites. That's a good thing to do anyway, but let's face it -- it may not make it to the top of the priority list until you begin to suspect it's causing you to rank lower. So you fix it and it has no effect on rankings -- OK, that's fine, your site is still better for it.