Was able to switch my F class MLE-AUH-SFO flight to F class MLE-AUH-LAX-SFO flight. At first they wouldn't add the LAX-SFO flight because there was no award availability but after I called a few times someone added it for free.
I'm tempted to try to change it to MLE-AUH-JFK-SFO to try the first class apartment. But since there is no F class award availability between JFK-SFO I don't know if I'll get luck again and have AA force an opening for me like they did with LAX-SFO.