No will shall be revoked except in the following cases:
(1) By implication of law; or
(2) By some will, codicil, or other writing executed as provided in case of wills; or
(3) By burning, tearing, cancelling, or obliterating the will with the intention of revoking it, by the testator himself, or by some other person in his presence, and by his express direction. If burned, torn, cancelled, or obliterated by some other person, without the express direction of the testator, the will may still be established, and the estate distributed in accordance therewith, if its contents, and due execution, and the fact of its unauthorized destruction, cancellation, or obliteration are established according to the Rules of Court. (n)