A consultant's report last summer warned the Minnesota Department of Transportation that the areas of the Interstate 35W bridge that were hardest to see were considered most susceptible to fatigue cracking. The consultant told state officials that if a crack did occur from some unusual causes it wasn't likely that it would be discovered quickly. Bob McFarlin, assistant to transportation commissioner Carol Molnau, does not dispute the report's warning. But he told MPR that the National Transportation Safety Board will look at all inspection reports as part of its investigation.