Alfa Romeo Spider 939 Hydraulic Pump

[JagAlfa]

Hi, I would much appreciate information on the procedure to replace the fluid in the pump for the folding roof. I have a 2006 spider with 100ks on it. All has been well with this car over the years bar  an aging roof and my lack lustre attempt at replenishing the pump fluid. Things were moving a little slowly but I need to get the pump sorted before I can diagnose what the real issue is. Cheers