Hire a probate litigation attorney and demand an accounting from the Trustee as it seems they may either have negligently or intentionally wasted the Trust's assets or they are very disorganized and have not kept a proper accounting of the Trust assets? You can make a demand on the Trustee that the Trust pay for your legal expenses in obtaining the accounting and if warranted a removal of the Trustee for breach of his/her fiduciary duties. You can do all this yourself, but it is ill advised, you don't want to ruin your case because you failed to follow the required probate laws or you get out-lawyered by the other side! if there are other beneficiaries, you can join together and share the expenses of a lawyer.
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Only the clerk of the court, a judge, or an attorney of record may issue a subpoena.
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You can not subpoena records unless it is part of a pending suit in which you are a party.
However, the facts here are not clear. You mention a trustee but also mention a probate estate. If the person is acting as a Trustee, it will be under a living Trust, which is not in Probate Court. One way or the other, it seems you are guaranteed at least the 17K, so it's worth it for you to retain an attorney to take the proper action.
This comment does not create an attorney-client relationship. The law and its application by the courts is constantly evolving and changing. This discussion is not to be taken as a definitive guide, and should not be relied upon to determine all fact situations. Each set of facts must be examined separately with the current case and statutory law analyzed and applied accordingly.