They both need to be replaced It looks like. I just got done replacing both of mine. I have found on insights that usually the master goes first but In my case it was the slave, at only 77k miles. They are worth replacing at the same time. You car see the master has leaked down on on your firewall that's what the stain is underneath it on the black insulation. And it looks like the slave is leaking too. That's how mine was. I tool the rubber boot off the slave and a bunch of fluid came out.
There are instructions on this forum on how to do both with pictures. It was under something like "resurrecting an insight" or something like that. I can look later if you can't find it and need it.
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