I've been hearing a hissing sound for a while now and the trunk stopped working about a year ago, meaning the button push on the trunk when the doors were unlocked (had to use the key or button on the door pillar). I pulled the liner out today and could hear air coming from the actuator. The double click did not work.
I have a spare trunk, pulled the actuator out and swapped it with the old one. That got the locks and trunk working 100% again. I could see the rubber part of the boot was torn so def check this if you guys have a similar issue. It's an easy swap once you remove the liner.
The QuattroWorld website is not affiliated with or endorsed by Audi AG or
Audi of America, Inc. AudiTM, QuattroTM, Avant,
Tiptronic, FrontTrak, A2, A3, A4, A6, A8, S3, S4, S6, S8, TT, TT-S, R8,
RS4, RS 6, Q7, Q5 and allroad quattro are trademarks of Audi AG.