19330.  If proceedings are commenced under this part for the
settlement of claims against the trust, and the time for filing
claims has commenced, any action upon the liability of the surviving
spouse under Chapter 3 (commencing with Section 13550) is barred to
the same extent as provided for claims under this part, except as to
the following:
   (a) Any creditor who commences judicial proceedings to enforce a
claim and serves the surviving spouse with the complaint prior to the
expiration of the time for filing claims.
   (b) Any creditor who has or who secures the surviving spouse's
acknowledgment in writing of the liability of the surviving spouse
for the claim.
   (c) Any creditor who files a timely claim in the proceedings for
the administration of the estate of the deceased spouse.