(a) If evidence concerning execution of an attested will which is not self-proved is necessary in contested cases, the testimony of at least one of the attesting witnesses, if within the state competent and able to testify, is required. Due execution of a will may be proved by other evidence, including an affidavit of an attesting witness. An attestation clause that is signed by the attesting witnesses raises a rebuttable presumption that the events recited in the clause occurred.
(b) If the will is self-proved, compliance with signature requirements for execution is conclusively presumed and other requirements of execution are presumed subject to rebuttal without the testimony of any witness upon filing the will and the acknowledgment and affidavits annexed or attached thereto, unless there is proof of fraud or forgery affecting the acknowledgment or affidavit.
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