I"ve owned three roadsters, one went to 100,000 miles. So far, never even so much as added fluid to the tank. If the top opertes fine but there are leaks, just do the cylinders.

WATCH IT with the sensors on the cylinders. When you put the car back together, the top will not work. PERIOD.
The issue will be how you have one or more cylinder sensors seated. I've seen it three times now - it's tricky to get them to seat but you CAN do it.

May I ask: Miles? Is it stored in winter? How often do you exercise the top?

I can't understand why some people have so much trouble and many of us NEVER have an issue with the top system. I have noticed that people who store their cars in winter have more issues - that's why I exercise my top every three weeks, year around.