Check with your Trek dealer and ask about warranty replacements on those wheels... Trek has covered a lot of failures for Bontrager wheel sets because of poor designs and one friend had his Bontrager wheels replaced after 4 years as they started to develop multitudes of cracks at less than 1000 miles of riding the bike and I have helped other people get satisafaction after they also experienced failures with the stock Bontrager wheel sets on what have been pricier models.

The paired spoke design is one of those failures and a wheel set on a bike as pricey as the Portland should go well beyond 2500 miles.

You might get some new wheels for 0.00 and consider also that Trek has pretty much abandoned using paired spoke wheels because of the many issues customers were having with them.