My experience has been that all new coaches need a little time to work out the noises. Dashboards have alot of parts that can rub/rattle until some of the edges get worn off. I would suggest giving it some time to settle out, unless you can have your co-pilot try to locate the source while you are underway.
The lead culprit for me in terms of creaking/rattling has been the entry door, particularly the screen door. We've fought this for two years, and have finally resorted to wedging a rag between the door and the screen door. Not elegant, but seems to provide some quiet.
Noise has become more of a problem for me lately. I just got hearing aids
and now I can hear EVERY rattle, bump, and buzz in the whole darned coach. Next trip I am taking them off!