Pez, my advise would be go to home depot and buy a cable tracer, that's where I got mine cost about $25.00, it has four different sounders all color coded and easy to use. takes a couple hours if you make labels and tag all wires.
I can tell you there is a power wire that goes from bedroom and is attached to one of your roof top cables, once you remove the caulk just pull line out a little and it is taped to cable. You will not need to do this unless you are hooking up a satellite dish.
I have a 2015 39 MB model and the splitter for living room cable was located by the rear left living room light, that is if you are standing at door looking to rear of unit. It was easy to find once told that, as some are located in bedroom overhead depending on model. My cable hook up from my basement went to the bedroom, then to the living room, but line was apparently run down the left side to rear of unit.
Hope this helps, I could not get a diagram of way cables were run, so I did it myself as many others on this site also. Good Luck.