We had the same problem on our 2012 36FL. In fact, on our delivery day when they put that slide out, it did slice the carpet (which the dealer replaced). There are screws that hold that front piece on...they are well hidden in the carpet. Once you find and remove the screws, you can fold that piece back to get access to the wiring bracket.
Bob and Debbie (both retired) with Senior FurBabies Grizz (a German Shepherd mix) and Bailey (a Lab mix)...and sometimes a Grandkiddo or 2! Full Time RVers since July 2013 Redwood: 2012 36FL with sliding patio doors
Tow Vehicle: 2011 Chevy Silverado 3500 HD with 6.6 DuraMax Dually