Hi guys

New member here.
I'm in the UK and own an r129 500 SL from 1992. My room has stopped working.

The roll bar works but when it's down it flashes. When I manually put the roof down the red light blinks and beeps whenever the car moves.

I changed the hydraulic fluid in the reservoir last week, it was black but still very full. Put the hydraulic fluid for the car from mercedes but still no joy.

Any advice is welcomed (bear in mind I'm not very technical on cars but I'm trying to learn)