Hey I'm new to skid steers. Not a professional. I recently purchased a 2016 TL10. The hydraulics have not been used. Only the bucket. I had trouble hooking up the brush cutter to the aux. The face of the couplers were kinda corroded. I was finally able to push in the hoses. When I tried unhooking, the closing part didn't pop out to shut off the flow. It is stuck. Any advise.