You're right, it's broken down grease. The A200 doesn't have a rubber seal to prevent this from leaking, either. That's normally OK, when the grease in reasonable condition, but when it breaks down bad enough, you see what you're seeing. The grease needs to be changed which requires disassembly of the transmission. It's quite a job (and very messy) if you're not familiar with it, but if you're interested I know I've read (and may have written one) instructions on disassembling the transmission on this website. If you decide to do the job yourself, be sure to remove the attachment hub (comes out to the inside of the transmission) and clean the passage well.
Answers & Comments
You're right, it's broken down grease. The A200 doesn't have a rubber seal to prevent this from leaking, either. That's normally OK, when the grease in reasonable condition, but when it breaks down bad enough, you see what you're seeing. The grease needs to be changed which requires disassembly of the transmission. It's quite a job (and very messy) if you're not familiar with it, but if you're interested I know I've read (and may have written one) instructions on disassembling the transmission on this website. If you decide to do the job yourself, be sure to remove the attachment hub (comes out to the inside of the transmission) and clean the passage well.