I noticed this 'line' of at-the-time unknown substance on three of the four SERKs that I eyeballed on different dealer's floors and one that a friend of mine purchased.
The bike I bought has not (as of yet) exhibited this-----BUT, my bike came with the wrong cover(there was a 2003 100th Anniversary 'SMALL' cover in a bag (with the same logo) in my saddlebag, and the left saddlebag's red reflector was missing!!! No evidence (PSA adhesive residue) that it was ever attached either.
Quite a bit of unwiped polish residue as well, and a non-clearance problem with the right saddlebag and painted filler strip. This was fairly easily corrected by me with adjustment of several mounting bolts, but I couldn't help but think at the time that I shouldn't have needed to be doing this as I paid that dealer prep fee.
These things noticed after the bike was delivered to my residence---weather was too wet and cold to ride it home.
Mostly silence from the dealer's staff when told about these 'issues', and to their credit, I have been called and told that the correct cover and replacement reflectors are waiting to be picked up.
I was under the impression that the CVO bikes were given a lot more scrutiny both during and after assembly wrt details. Makes me wonder what the 'regular' bikes have overlooked or omitted on them. Makes me wonder what things INSIDE the bike may have been shortchanged, etc., and it sure makes me skeptical about the competency of any future service I might be having done there.
You better believe I personally checked all fluids before taking my first spin and tire/shock air pressure.
This from a dealership that bragged quite a bit about all their GOLDEN Bar and Shield awards for exemplary customer service!
Stuff like this:
I had to reposition one of the muffler heat shields and the left top pipe heat shield.
The pipe shield still doesn't look right, gaps at the bottom, I'll try to get it replaced.
All the exhaust clamps were "showing", not a good thing. I rotated them around to hide the bolts.
Handlebars were off center in the clamps, the knurled part was visible.
Had a big ol piece of shrinkwrap stuck to the front of the oil tank, a real bear to get it out of there.
I had to buy the tool to adjust the rear shocks preload, it's not expensive but if they offer adjustable shocks then the tool should be included. They must be taking notes from Honda on that one.

On the positive side, it runs good, doesn't burn oil and the mufflers are getting a deeper sound with time.