Did I break my mulcher?

I'm new to running a Kubota SVL97-3 and a big disc mulcher from Freedom Attachments (FADM6000: https://freedomattachments.com/skid-steer-attachments/) -- I was using the mulcher the other day and then I got a notice of low hydraulic oil. I stopped running and noticed that the case drain line had popped off. It wasn't damaged or anything, I think I just didn't fully seat the quick connect when I hooked up the mulcher.

I reconnected the case drain, shut down aux hydraulics, and drove back to the barn. I put 4 gallons of oil in, the meter read 100% full, and I went back to some mulching. Another hour or so of operation later I got a low oil warning again. It appears I'm leaking oil onto the top of the disc. Any ideas what I broke or how to fix it? I guess I must have blown something in the motor on the mulcher? I'm going to get in touch with the dealer this week for advice but I thought I'd ask here too. I'm pretty new to all of this stuff. Thanks in advance.