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Much of these problems come from the taillights or third brakelight.
You could also check the doors inner panel, sometimes the seal becomes porous and lets rainwater in the interior

Maybe the golf mk4 or mk5?

Maarten wrote: ↑Tue Jan 30, 2024 1:41 pm Probably above the right rear wheel arch in the boot, behind the carpet.

I wrote IN the boot.
So inside the trunk.
Luggage compartment

So not outside the car

Glad you got it out.
Try to put the screw back for the new barrel.

No the screw is for retaining the barrel.
You could try to take the doorcard off and the inner panel.
Then try to push the barrel out from the inside.

Or try to remove the cover surrounding the barrel and use a plier to grab and pull the barrel.

Probably above the right rear wheel arch in the boot, behind the carpet.

Screw should have stayed in.
With the key in the barrel you can pull the barrel towards yourself.
You may have to wiggle a bit

There are numeroes YT video's on the subject.
Look for the golf 4 vids, these are essential the same locks

Maybe the beeper in the rear is covered by something that result in lower volume?
My FL AW has no problem with the sound volume front or rear, setting is about half way and loud enough

You have to loosen the screw that holds the barrel in place. (above the doorlock screws same height as the lock)
DO NOT REMOVE THE SCREW COMPLETELY!!!

Just use half turns whilst trying to move the barrel towards yourself

No need to remove the doorpanel

Sometimes they won't budge.
My old 9N3 2008 removed without issue,
My wife's old 9N3 2007 I had to pull out the old dremel.

Use a dremel to remove the nut.
Make a cut, be careful not to destroy the washernozzle

This is mine for the R-line.
It is slightly bigger than the black one

Do they work when you use your key in de lockbarrel outside en hold it in the open lock position?

Did they use the right oil in the recent servicing?
Because problem seems to disappear when oil is hot (and thin enough)

I think he means that the car goes (i.e.) from D6 -> D, disconnecting the gear, so the car floats without restraint (or something)

Or with the 4 cilinder it could also mean ECO when using only 2 cilinders (ACT)