In our Pinnacle there is a release cable inside the cabinet to the lower left of the TV. It is located just below the top of the cabinet so you cannot see it unless you get down low and look up. Yours might be set up the same way.
Craig & Terry in Tennessee
2013 Pinnacle 36 KPTS, Voyager Rear View Camera
2012 F350 CC LB King Ranch, 6.7L TD, Ford 25K hitch, TM TPMS, Diesel Site Coolant Filtration System