California Code, Business and Professions Code - BPC § 7669

An apprentice who has had his or her certificate of apprenticeship suspended or revoked may, within one year after the suspension or revocation apply for reregistration upon compliance with the law in effect at the time he or she so applies and payment of the apprentice application fee fixed by this chapter.  No reregistration shall have the effect of continuing an apprenticeship beyond the period specified in Section 7666.

The bureau may, when the circumstances warrant, allow an apprentice credit under a reregistration for the time actually served under a previous registration, but if the previous registration has been suspended or revoked for unprofessional conduct, not more than 75 percent of the time previously served shall be credited on the reregistration.