I have a 2018 Bighorn 3160el and I am trying to gain access to the rear cables of my living room 55" TV.. The TV is flush with the cabinet and all I can see are the bottom brackets holding the TV in place. I am told there is a release handle behind the TV but I can't seem to locate where it is. Can anyone give me a clue where it is and how it operates..Thanking all in advance.