The answer here would depend on how the original power of attorney was worded. If there is any language in it that specifies that if you are unwilling to act as the attorney-in-fact under the power, the secondary person then takes over, all that would be required would be for you to execute an affidavit that you are no longer willing to act in that capacity.
If the original power doesn't allow you to resign, then you would likely have to get a court order to allow the secondary attorney-in-fact under the power to take over. I'd suggest you contact your county bar association and ask for a consultation under the local lawyer referral service; these are generally either free or no more than $50 for a half-hour consultation.
Of course, as with all of my online answers, my advice is limited by the brevity of your question and the facts provided. Additional information would be required to provide definitive legal advice, so this answer isn't intended to, and does not, create an attorney-client relationship.
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I agree with my Pennsylvania colleague, except to add the following:
Once you have signed the Affidavit resigning as the Agent, you should advise the successor agent that he/she should attach the Affidavit to the original power of attorney so that all interested parties will know to recognize the successor.
It's a small matter, but it may make the difference between the successor being recognized, or not.
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In addition to the comments made by the other authors, I would seek a discharge or release. This can be granted by the Successor Agent or through the eventual heirs of the estate. You want to ensure that no one will question your actions in the future. If you cannot get releases signed on a voluntary basis, I would file an application with the local probate court seeking an approval of the account. It seems like you have done a great job. You should protect yourself from someone who may not appreciate your efforts.
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