1. Named and retained. No action against a server may be maintained unless the minor, the intoxicated individual or the estate of the minor or intoxicated individual is named as a defendant in the action and is retained in the action until the litigation is concluded by trial or settlement.
2. Several but not joint liability. The intoxicated individual and any server, as described in section 2505, are each severally liable and not jointly liable for that percentage of the plaintiff's damages which corresponds to each defendant's percentage of fault as determined by the court or a jury.