hydraulic roof question

Sorry to ask a question thats probably been asked a million times.
ive recently purchased a second mk1 clipper off flea bay, to cherry pick the good parts for the older mk1 gti.to make one good, and one not so good one out of the two
the clipper comes with a non functioning electric(and leaky) roof, for some reason the switch had been disconected at the dash, so when i reconnected it i was quite pleased to hear the motor wiring( very slowly) but not up 'n' down action,  on closer inspection the spare wheel well is full of a milky oily goo, like melted treacle,which may be from something else thats leaked in the boot during storage,because  i cant see a leak in the pipes/ reservoir, and when i undid the three sided bolt on the top(which i assumed was the filler plug) fluid leaked from out of the two halves, before i quickly tightened them back together.
any ideas on how to diagnoze or check the fluid level 8)
sorry but my topless fun is usually, dare i say it aircooled and tax free

PowerHood - the above in pdf

PowerHood circuit diag pdf

cheers for the pdf, my motor is very different, and has a tight cone shaped bung in the top, with no fill level, any way ive topped it up, bled the system through and it now works, of a fashion, one of the hydraulic rams has a loose lower mount, which has allowed the arm to move when being raised and lowered, this has meant the ram has operated through a slightly odd angle, and subsequently knackered the seal, now when it actions it dribbles fluid, any suggestions where i can get anew or good secondhand ram from, without speaking to a mortgage company 8)  8)