This repair guide explains how to replace the side brush module on a 500 series Roomba. For details on how to first disassemble your Roomba, please see Roomba 500 Series Servicing and Repair Guide Chapter 3: How to Open Up Roomba. Some of the 500 series Roombas are pictured below:
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This is a companion discussion topic for the original entry at https://community.robotshop.com/blog/show/chapter-5-how-to-replace-roomba-500-series-side-brush-module