I would have the company pull up the boards over the beam area and install the proper flashing to direct water to either side, similar to Joe's recomendation. The caulking in the joints between the boards will not solve the problem very long. I'm not sure if they used vinyl gutter, but aluminum gutter and/or Trim Coil flashing will need to be shielded from contact with the treated wood. The chemicals used in the treatment process contain copper which will react with aluminum. The actual manufacturer of their product should have instructions for this situation. Remind the owner of the company that you will report this to the Maryland License authority and will post it on Angie's list if not corrected in a timely manner. That will get their attention, as they are listing Angie's list in their advertisements. Last resort is to hire an attorney.