Totally agree with everyone above that to reach any real conclusion, a full review of the documents would be required. However:
*Unless they resigned or were removed by the employer, the two individuals in question are probably still the trustees.
* You should identify who is the plan "administrator" or "administrator" under the document. This person is usually the company itself, but could be a "committee," but this person or body under most plan documents would have greater authority to approve a distribution than the trustees. Unless the plan administrator is the two individuals who are trustees, I would see approval for the distributions from the plan administrator.
* I would also identify who under the plan document has the authority to remove and appoint trustees. Almost certainly it is the company, e.g. if a corporation the board, if a partnership the Managing Partner or Management Committee. I would inform that person or body that they should consider that two departed individual who are seeking distributions are the plan's trustees and that they should consider appointing new trustees.
* If you do bullets two and three above simultaneously, you may find out pretty quickly whether, aside from legal issues, making the distributions will be controversial.
* Most likely as the TPA you are not required to take any controversial actions.
* Remember, distributions generally must be made "as soon as administratively feasible." The circumstances you describe should impact the timeframe of administrative feasibility here.