Roomba maintenance and troubleshooting

My 6+ year old Roomba is misbehaving, so today I'm giving it a servicing and diagnosing the problem.  
And giving it a long overdue cleaning.


After several comments, I decided to do this: Roomba repair update
Place your bets on how long it will last.

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This isn't the only way to do it.
It's probably not the best way to do it.
But it's how I did it.