T_ELSE Error When Editing a Post

Hi.

I’ve got an existing published post on my blog. I’ve noticed some corrections I’d like to make, but every time I attempt to preview or publish an edited version, I get an error. This error pops up even if I make no changes to the post. Just the act of hitting the edit link and then previewing or publishing the post seems to cause the error.

I think it might be connected to the code I’ve used between
<pre> tags in the post, but I’m not clear why it would work when originally published and not when edited. Has anyone come across this and come up with a solution?

Thank you.