2009 Cadillac CTS. The trunk will not open. It does click (door release & keyfob on 2009 Cadillac CTS

It has done this in the past but opened after banging on trunk and mechanism. Is there a release somewhere else that can be reached through the opening in the back seat?

Asked by for the 2009 Cadillac CTS
yes should be an emerg release cable, look for yellow t handle