Your EAD and AP can be renewed as many times as you need them to be - free of charge - until your green card is approved.
Simply submit a new I-765, together with a colour copy of the front and back of your current EAD and a copy of the NOA for your I-485, 120 days before your current EAD expires (you're a little late, so you should do this now).
Just checking on something - you said you had "biometrics for EAD" but that should have been for AOS as well. Check your appointment letter - it should have had both receipt numbers on it (one for the I-485, one for the I-765). (I missed that part in your original post where you said your EAD ran out in February - I though you meant you never got your EAD at all, my mistake, my first post probably contributed to the confusion).
You can try an infopass appointment but I have seen others here try that and it doesn't seem to help much since your local office won't be able to do a lot without the paperwork, which is at CSC. The only thing people have been able to achieve with an Infopass appointment is a service request, but you've been able to do that yourself by phone and it hasn't helped.
Here are the steps I took when I was in your situation:
-Service request (came back with some lame reply that they are really busy right now and be patient)
-Email CSC directly (they replied, but didn't seem to help much, same kind of response as the service request)
-Senator (could only help once application had been at CSC for over six months, after that they can request the file be "pulled"
-Ombudsman (they took a while to get back to me, and were very nice, by that time the application had already been approved)
Out of those the senator's office was the one that made the difference. Once they were able to request the file be pulled, my application was approved within a few days. I think the ombudsman's office would have helped too but by the time the made an inquiry to CSC, it had already been approved.
Yours is an unusually long wait but there was someone here else recently (Soju) whose application took over a year.
