(a) Decision of majority.--If a dispute shall arise among personal representatives, the decision of the majority shall control unless otherwise provided by the governing instrument, if any. A dissenting personal representative shall join with the majority to carry out a majority decision requiring affirmative action and may be ordered to do so by the court. A dissenting personal representative shall not be liable for the consequences of any majority decision even though he joins in carrying it out, if his dissent is expressed promptly to all the other personal representatives: Provided, That liability for failure to join in administering the estate or to prevent a breach of trust may not be thus avoided.
(b) When no majority.--When a dispute shall arise among personal representatives as to the exercise or nonexercise of any of their powers and there shall be no agreement of a majority of them, unless otherwise provided by the governing instrument, the court, upon petition filed by any of the personal representatives or by any party in interest, aided if necessary by the report of a master, in its discretion, may direct the exercise or nonexercise of the power as the court shall deem for the best interest of the estate.