Take it to a professional. This is not a DIY job.
No.
Where is the hydraulic reservoir for 1988 Chysler Lebaron convertible top?
Yes
If one wants to use convertible top fluid on a 1992 Lebaron convertible, one should first put the fluid on a rag and begin to wipe down the top. It is important that one spread the fluid evenly on the top.
behing the rear seat
It goes up and down. Or not sometimes...
in the trunk.. upper right side...
Automatic transmission fluid.
I have a 1994 Chrysler lebaron convertible GTC the top motor went out I changed the relay which is right beside the top motor. And that did not fix the problem so I got a ice cream bucket and unhooked the two oil lines that attach to the motor which is behind the back seat under the well cover. I put the ends of the oil lines in the ice cream bucket and removed the top motor the a friend and I pushed the top down by hand to push out all the oil from the lines. Now my convertible top is manual. Don't put lines back on motor or it will not work.
Plastic
Yes they could leak.
There is no definite time that you need to replace a convertible top. If it is properly maintained then it can last for many years.