Mega,
I'd say your just worrying too much.
I have a Hungarian Wax plant that had a few leaves start looking like that after a while, and eventually they fell off and were replaced by new ones. I think it's just part of the cycle.
You may want to check for mites too. Just to be safe. A pot up probably couldn't hurt either.
And I highly recommend the book. It's an interesting read for chiliheads like us, and it has a lot of great info in it, but a lot of that you can find here if you look in the right places. It's by some professors at the NMSU-CPI, so you can get it there.
Good luck!