The radio and the leveling system are tied to the Chassis battery. I recently had an issue with my chassis battery not holding a charge (bad cell), and if I tried to use the leveling jacks, it would show "Low Voltage". Could your Chassis battery be low? Press and hold the battery boost switch for about 30 seconds and then try the levelers again (keep the Battery Boost switch depressed). also, before you use the battery boost switch, disconnect the coach from Shore Power, and look at the battery voltages in the overhead compartment. What is the chassis battery reading? Also the Battery Disconnect switch, disconnects the house batteries from the system, but does nothing that I know of, with the chassis battery.
I know that's allot of Also's, but it seems like you were more than cautious enough when replacing the batteries. Check your voltages, then plug her in and let everything charge up. It's possible your chassis battery got low, while you did your swap.
Bill & Denise
2014 Bay Star 3103 - 5 Star Tune, CHF, Magne Shade
2016 Jeep Grand Cherokee 4X4 Limited