You can removed it from the wall. There are 4 screws that hold it in place. Don't recall where the screws are located, but they were on the face side of the panel. When I removed mine, I could only pull it out a little ways, just enough to get a hand in there, as the main power cord was clamped to the floor. Reached in, removed the fasteners, and then it popped right out. It's a rat's nest back there. I would recommend checking all the terminal lugs and tighten them down. I found a few that were loose.
When I put it back together I installed the wire clamp in a different spot, so I could get the panel in/out in the future with a bit more easy. But make sure to add that clamp, so when you pull the cable out of the hole, you do not yank directly on the terminals.
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