Not sure, but one thing to note is that when new and you are running break in oil chances are it's not going to shift as well as it will after the first oil change when you are then running regular oil. break in oil contains no friction modifiers to allow for some engine wear so it breaks in. It also will not allow optimal shifting. i wouldn't worry too much. Just mention it to the dealer at the first service where they change the oil and if it still persists then have them check it out. you may also want to check your clutch cable. it may have too much slack in it. Thats happened to a few people here with the same or similar symptoms as yours.
No idea, but you'll know soon enough ! One thing i have seen a lot of here are scenarios where dealers will say they found the problem if they cannot figure it out rather than admit they couldn't. Then you ride off only to find it didn't help. Thats very typical in all repair fields because there are always problems that are hard to troubleshoot even for the best. But you may not be in that boat so see how it goes. He may have been right.