Really only a guess at this point, but if there is fluid leaking then you have a problem. The system likely can not build up the pressure required to lift the roof which is heavy. Once you have located the leak then I would take it to a reputable mechanic who should have no problem understanding the situation. The hydraulic portion should be fairly straightforward. The electrical portion controls the timing of everything and may require a different level of knowledge. There are a number of members on this site with more knowledge than I have. Please chime in if you can. I am sure that the fluid/moisture that you describe should not be there.
Like one of the members suggests,,, these cars are sweet when they work. "When they work"