You just have too many facts to ferret through over the internet, and I am confused about the TRO, who won at small claims, what the "judgment hearing" was about.. At the very least, call the attorney back and let them know (and put in writing to that attorney) that you were not given notice of any hearing.
I can not tell if you are in Colusa, El Dorado or San Diego county. Regardless, I advise you consult with a legal aid attorney in your area. So long as you are a low-income client, a legal aid agency can help you and is at no cost. Legal aid attorneys are highly trained and experienced in this area of law. Make sure the agency is an actual non-profit LSC-funded agency - if they try and charge you, it is a sham organization.
In order to prove a defamation case you have to show that somone, told another person something false about you, that caused actual damages (not just emotional/psychological). If you can prove these things, you might have a claim for defamation. That being said, I agree with my colleagues that the complexity of your post indicates you should consult face-to-face with an attorney and show him/her the documents supporting these facts. Best of luck.
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Because your claims against your former landlord all have to do with court proceedings, any action against him would be a SLAPP, or Strategic Lawsuit Against Public Participation. On top of everything else, you would have to pay his attorney's fees.
Call his attorney and work out a date to go to court.