Plaintiff lawyers are making another attempt at a class-action suit accusing Horizon Blue Cross Blue Shield of an illegal scheme to cut reimbursements to certain health-care providers — and this time they claim to have a smoking gun.

The amended complaint, in Edwards v. Horizon Blue Cross Blue Shield of New Jersey, 08-cv-6160, filed Jan. 30 in federal court in Newark, is the latest salvo in a seven-year-long litigation alleging New Jersey’s largest health insurer under-reimbursed ambulatory surgery/surgical centers outside its provider network.