California Code, Labor Code - LAB § 5908.5

Any decision of the appeals board granting or denying a petition for reconsideration or affirming, rescinding, altering, or amending the original findings, order, decision, or award following reconsideration shall be made by the appeals board and not by a workers' compensation judge and shall be in writing, signed by a majority of the appeals board members assigned thereto, and shall state the evidence relied upon and specify in detail the reasons for the decision.

The requirements of this section shall in no way be construed so as to broaden the scope of judicial review as provided for in Article 2 (commencing with Section 5950) of this chapter.