As a financial advisor, you’ve been volunteered as a plan ombudsman and the problem is that you probably don’t have the knowledge of an ERISA expert.
That’s why it’s important to work with ERISA experts like ERISA attorneys, and especially the third-party administrator (TPA). Let the TPA do their job, whether it’s the administration or fixing the problems of the previous TPA. While you’re worried about your client and your relationship, trust the competent plan providers that the plan sponsor has selected and get out of the way.