I finally got the tailgate open after 30min. by turning the LF door key in the cylinder back and forth with someone holding the tailgate handle and pushing the tailgate release button. Removed the inside tailgate panel and inspected everything. With tailgate open, observed the cylinder lock when remote was pushed or LF door locked, but would not unlock. Tried to replace the tailgate lock assy., but no luck. Opened up inside trim and inspected the wiring, but found no broken wires. Will now try to replace the LF Door lock assy. to see if by chance this will solve the problem. We bought the car used 18months ago and all doors,tailgate worked fine with the LF door key, except the gas door, which was broken. The remote was missing, so we bought a new one from the local Volvo dealer and had it programed accordingly. All doors,tailgate worked fine. Since the wire harness seems to be intact, and if the LF door assy will not solve the problem, where should I look next ?