California Code
CHAPTER 1 - General Provisions
Section 10107.

10107. Any claim or right arising out of an alleged default or breach of warranty may be discharged in whole or in part without consideration by a written waiver or renunciation signed and delivered by the aggrieved party.

(Added by Stats. 1988, Ch. 1359, Sec. 5. Operative January 1, 1990, by Sec. 11 of Ch. 1359.)