With the bed disassembled you should be able to see the limit switch. On my Adventurer, which is very similar, the switch is center left 1/2 the way up from the bottom.
It’s fairly easy to spot and you should see two yellow wires connected to it. You can bypass the switch by removing the the two wires and connecting them together, as that’s all the switch does.
By the way, with Winnebago wiring all 12v positive is yellow and negative is white.
Winnebago has full parts and wiring diagrams available at the website under the Owners tab.
Here’s a link to the 3D interactive parts list that includes the bed. You can move around and zoom in on the switch. It takes some getting used to working the 3D motion.
Also here’s a screen shot of the switch viewed on the 3D parts list the switch is highlighted in yellow. You are viewing under the bed as if the whole bed was tilted up from the left and sitting on the right side edge.