on my 29M, the splitter was behind a wall panel in the entertainment cabinet.
It was directly below where the antenna was mounted on the roof.
Hopefully, your layout is similar.
It wasn't too difficult to remove the wall panel, but it's been awhile since I had mine removed, so I can't list out the steps.
I recommend tightening all connections once you do find it. Some of mine were loose.
Bryce, Gracia & Shadow (4 yr old mini-Daschund mix)
US Army vet- 82nd Airborne Div