"The Board finds that there was a fatal flaw in the investigation of this matter.
The investigating officer did not permit cross-examination of its key witness to the
extent desired by claimant's representative. This was improper and, in fact, could indeed
have precluded the most important evidence from the claimant's point of view from being
introduced. However, the Board has no knowledge of what this testimony might have been
and, therefore, the lack of due process accorded to claimant is sufficient to overturn the
conclusion reached by Carrier. We cannot reach the merits and the claim must be
sustained."