Lost power to outlets in the slide out with TV and dinette as well as outside kitchen area. Help.

I have a 2018 heartland elkridge 39mbs and i lost power to all my outlets in the slide out with tv and dinette. I could only locate one GFI outlet in the bathroom and that is not the issue. I flipped all the breakers and that did not help either

Under the slide somewhere on the coach frame you will find an electrical box.
Open it and check the wire nuts.
Be certain to unplug from shore power and turn off your generator if you have one.

Peace
Dave

Assuming you have 50 amp service, 1st thing I'd check is the shore power cord where it connects to the RV. Make sure it's seated fully, and locked. After that, check the power pedestal for 2 hot legs or have the park check it. If all that's good, look at the box(es) under the slide(s) as Cookie suggests.