Cal. Sts. & High. Code § 5367

Upon such appeal, the legislative body may remedy and correct any error or informality in the proceedings, and revise and correct any of the acts or determinations of the street superintendent or engineer relative to said work; may confirm, amend, alter, modify or correct the assessment or diagram in such manner as to it shall seem just, and require the work to be completed according to the directions of the legislative body; and may instruct and direct the street superintendent to correct the warrant, assessment, or diagram in any particular.