1. Level. Are you actually level according to a 4' level front to back, left and right? We use auto level but then follow up with a 4' level. I put it on the hinge of the basement door next to the level up control panel. Also the front compartment hinge. In the factory tour video they recommend to get a really good flush on your black tank to raise the front. This should NOT be necessary for regular draining.
2. AC. 1st verify you have 120vac on BOTH legs of your power plug at the pedistal. Cycle your circuit breakers. Each AC unit is on a different leg of your power panel. Try swapping the thermostats from the living room to the bedroom. If this does not work put them back. Call Dometic. They have excellent customer service. Cut every other fin out on your ceiling vents. This GREATLY increases your air flow and AC efficiency!!! I just did this. We are currently in Moab Utah. 95° outside. We can only run 1 AC at a time. If we have both on it gets too cold (68°). Some have replaced the vents with adjustable ones to better direct airflow.
3. 12V system. As Carl said, if you do not have a multimeter, use your level up control panel to read your battery voltage. Page through the menu to find it.
PD converter troubleshooting
https://www.progressivedyn.com/suppo...ooting-guides/.
You can force the converter to cycle through the power wizard modes for troubleshooting.
Read the Guide to Wizzard, understanding the button and light.
Again as Carl said verify the battery disconnect switch is "ON" and the key will not come out.
Personally I suspect you are missing one of your 120vac legs. Too many electrical things failing at the same time for a coincidence.