I get the feeling that your distribution panel is separate from your converter. Mine is that way, the 120VAC is one panel and there are 12VDC panels in various locations. I'm sure mine is different than your's so we need to know something about it.
If you can, take a picture of the distribution panel and post that.
Basic instruction for replacing the panel are;
Take a couple photos of the panel with the cover plate off and the wires visible.
Buy a panel similar to yours, with enough circuits and KOs for the wires.
Label each circuit cable or wire with connecting point.
Disconnect both 120 VDC and 12 VDC power sources.
Disconnect the wires from the panel and then remove from the panel box.
Reassemble in reverse order.
"I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to go". R. L. Stevenson
David Bishop
2002 Winnebago Adventurer 32V
2009 GMC Canyon
Roadmaster 5000
BrakeBuddy Classic II