A federal judge on Tuesday said JPMorgan Chase & Co must face a class action lawsuit by investors who claimed the largest U.S. District Judge Paul Oetken in Manhattan certified a class action as to JPMorgan’s liability but not as to damages, saying it was unclear how investors could value the certificates they bought, given how the market was “not particularly liquid.” He said the plaintiffs could try again to certify a class on damages. Oetken ruled 10 months after JPMorgan reached a $13 billion settlement to resolve U.S.