Re: Tax Deferred Savings Plan - Trying to locate the plan administrator / custodian by the Plan Number (77-0109370-001). How do I identify the plan administrator?

Can someone advise how I can locate the administrator of a tax deferred savings plan?  Plan number is 77-0109370-001.  Do I call the IRS?  Do I call Fidelity, Chas Schwab, etc to locate?