My deceased mother had 3 CD's at Pittsburgh National Bank. I was the executrix of her will, and the CD's have never been accounted for. Last week they notified me they would not provide information beyond 7 years on closed accounts. The CD's were never closed.

How many years?
Who was to get them?
Try this and ask below if you need more help.
Unclaimed Money: Mary Pitman Answers Your Questions to Make You Money - ABC News

Unclaimed Funds: Tracking Down Moms IRA CDs | Bankrate.com since they may very likely be in the state's unclaimed money account.

If you were unaware of the CDs and 7 years have past the accounts have been escheated to the state. To claim these funds you have to contact the state Try here: Pennsylvania Treasury Department - Timothy A. Reese, State Treasurer

CD's are deposited for a certain number of years, If it was over 7 years after the CD's matured, as you were told, they were considered unclaimed since there was no activity.

With that said, the bank knows where the money went, so if you want an answer from the bank, get a court order from probate court, to order them to disclose the information.

With that also said, each year (or more often) the bank would have mailed information about these account to your mother, until at least they were considered unclaimed. Who was collecting your mothers mail after her death?