Do you have access to VCDS? If so, it might be worth trying to disable the electric blind option for the drivers rear door, recycle the ignition, and then re-enable it again, in the
hope that the electronics 'reset' the blind position.
I'm saying this based on it being with a garage for three weeks, and maybe during that time the battery was disconnected, or the car was jump started. Some weeks ago, my S8 was sitting idle for weeks outside and it wouldn't start. I got it jump started, but in the process, it played havoc with the MMI, with several functions disappearing completely. One was the visual when changing the temperature. Started it a day or so later and functions were back again. This sounds like the odd behaviour from the blinds.
If you're familiar with VCDS, go into module 72 (Door, Rear Right), and then into Coding, and you'll get the following screen. Make a note of the highlighted number ('0032623' in my case). Subtract 128 from your number, and then click 'Do It!'. After that, exit out of VCDS, re-cycle the ignition, and then go back into VCDS. You'll need to check and clear the Error Codes as you'll have one for the electric blind. Go back into Coding and change the number to the original number.
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts
My DIY jobs -
Replaced alarm horn,
Replaced Coolant Temp sensor,
Updated RNS-D firmware,
Installed Reversing Camera and Digital TV,
Dashcam Installation,
Retrofitted Rear Blinds,
Auto-Dimming Rear View Mirror,
Chrome Boot Struts
Sold! 2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights
My DIY jobs -
Fan Jet Windscreen Washers,
Retrofitted Electric Side Blinds