If the fluid is low in the slave, fill it and pump it, if you get normal clutch action it’s the slave. You may have to fill it several times. My slave needed replacement at about 95,000. Even though you have low mileage it’s probably an age issue more than mileage. The clutch, on the other hand, should be fine at your mileage unless really beaten. I’m at 100,000 now and probably have a new clutch in the near future.My 06 Goat just barely has 38k miles on it. Driving it the other day I gradually realized that the clutch engagement zone was getting lower and lower..