During 2019, the roof in the 911 was getting slower to open and close. Checking the hydraulic fluid reservoir, it was slowly dropping indicating a leak somewhere. No big deal, I'd top it up, and all would be well for a few months.
However, November 2019 I found a big puddle of hydraulic fluid in front of the rear left wheel - clearly a big seal had gone somewhere.
This is a reasonable common problem, especially on a 20 year old convertible.
The basics is that there's a hydraulic reservoid (only holing maybe 140ml or so of fluid, with the same amount stored in the hydraulic lines and actuators). However the seals eventually go bad with time. As they crack and leak, you lose fluid, to the point that there's nothing in the reservoir and so the roof won't open or close. A little leak can be topped up, but it's not a proper solution.
So I ordered a replacement seal kit on eBay, and waited until now (Aug 2020) for a global pandemic to shut my workplace down so I'd have some free time to get everything done.
For my loooong video see below!
10, 12, 13mm sockets/wrenches, 5mm allen key. Torx bits to remove rear speaker grilles. Some hydraulic fluid and a curved syringe or similar to refill the reservoir.