This question would be best addressed by a local probate attorney.
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Attorney fees are not likely to be waived unless someone did something wrong. Even then, fees would have to be recovered by the person who "messed up" and you will have to show that they did. A new attorney is not likely to work for free. However, I would suggest you speak with an attorney, discuss the situation and what happened, and see what can be worked out.
In California Attorney's fees in probate are primarily based upon the gross value of the assets in the probate. These are known as statutory fees. In addition an attorney is entitled to additional payment if they do work above and beyond the scope of a basic probate. These fees can be from helping with the sale of a house, negotiating with estate creditors, preparing the estate's accounting, or any number of activities beyond the basic filing and appearance. If re-opening this estate is part of the basic probate, he or she may have already been paid for it, if re-opening the probate is not to fix a problem with the basic probate then it is probably work for which 'extraordinary fees' will be required.
Your question is interesting -- how were heirs left out of being noticed? What do you want to accomplish by 're-openning'? With these quezstions answered I might be able to provide further assistance.
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