99Cabriolet Slow closing top

[bosalls5]

I was getting ready for some top down weather oiling the side flaps and hinge joints, etc. I went to close the top from the open position and for the 1st time closing was slow. All of the micro switches were making, it was just closing slower than usual so my 1st thought was low hydraulic fluid? I was parked on an incline?? The system itself is a closed loop so as a 2nd thought a leak at a cylinder or hose? It's a 99Cab with know history of top issues......give a shot of fluid?? Any advise would be greatly appreciated, thanks.