I fully agree.As per Sean66 - a trivial home fix!
No dealer needed. As if they were any use.
I would suggest that they’d be much more likely to respond with something along the lines of “No fault found” when you return to collect your vehicle.lf the fault is as described above, then it won't do any harm to leave it.
Maybe an idea to report it to your VW dealer, you never know they might say "ah yes we know what that is, we can do it while you wait"