I just wanted to report what might be a bug. Tonight we were working on HM Kephess, and after two attempts, we zoned in and trash was back up. We noticed that we were in a new instance server and figured, ok we will just reclear. We did that, did about 4-5 more attempts (about an hour) and the trash respawned again. It looks like the trash resets every time we zone in and get a 'new' instance of Denova.
It wouldn't be so bad if there were some cool trash drops
Hint hint BW!
Anyway, hope this helps get it fixed!