I don't know about repairable, but check a few things first, is it going in straight? If they get pushed on one side they tend to lock up. Need to pull all the way out and try again. This has happened to us a few times. The other thing to check is the mounting bolts for the back roller, make sure they didn't come loose and fall out and the roller is still in place and rolls freely. These have a tendency to come loose and it's extremely difficult to get the bed in if they are missing or not rolling correctly.
Hope that helps, good luck.
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