I would learn how to do these proceedures yourself. None of this is difficult. Is the boat in the water? The engine alignment needs to be with the boat in the water for several days after launch.
Buy a Jebsco or Sureflo pump on a bucket or a vacuum chamber to remove the engine oil. You can easily put a fitting on the pan drain plug, which remotes the drainage, and allows all of the fluid to be pulled out of the pan. There are also built in systems for draining oil--Reverso is one of these. I have not had as good luck with the hand pumps, or pumps checked into a drill.
We would change engine oil (with larger amounts of oil) at sea when crossing oceans. If you have the right set up, it is not messy and easy to do.
I think that the number of hours is excessive--Unless, the engine was not properly aligned at delivary. It should be the responsibility of the delivering dealer to be sure that the engine is properly aligned. Again, this means after the boat has been in the water for several days.
I would want to check and be sure that my dealer's technicians know how to align the engine.
Engine alignment--several sites to check on general problems:
http://www.yachtsurvey.com/alignment.htm
http://www.yachtsurvey.com/Alignment2.htm
A good book for all inboard diesel engine owners is Nigel Calder's book "Boat owners Mechanical and Electrical manual" and "Marine Diesel engines."
To check the alignment, loosen the bolts on the coupling--put a feeler guage between the coupling faces--it should be within .006 inches in four quadrants. You will have to raise or lower the mounts, and move the engine right and left at each engine mount until it is within tolerance. But--the engine should not change unless there has been some major problem.