N.Y. SCP. LAW § 2211 : NY Code - Section 2211: Voluntary account; proceedings thereupon 1

On  the  return  of  process issued as prescribed in the preceding
  section the court must take the account, hear the proofs of the  parties
  respecting it and make such order or decree as justice shall require.
    2.  The  fiduciary  may  be  examined  under  oath by any party to the
  proceeding either before or after filing  objections,  if  any,  to  the
  account,  as  to any matter relating to his or her administration of the
  estate. The party conducting such examination shall be entitled  to  all
  rights  granted  under  article thirty-one of the civil practice law and
  rules with respect to document discovery,  regardless  of  whether  such
  examination takes place before or after such party files objections.