If the due date of the balloon payment of a note subject to this subdivision is extended prior to the time notice is otherwise required under this subdivision, this notice requirement shall apply only to the due date as extended (or as subsequently extended).
"This note is subject to Section 2966 of the Civil Code, which provides that the holder of this note shall give written notice to the trustor, or his successor in interest, of prescribed information at least 90 and not more than 150 days before any balloon payment is due."
Failure to include this notice shall not invalidate the note.
Ca. Civ. Code § 2966