Is a state law action brought by a Plan Participant for an injunction barring an ERISA welfare benefit plan from enforcing its subrogation/reimbursement terms a claim for equitable relief pursuant to ERISA Section 502(a)(3), 29 U.S.C. 1132(a)(3), and therefore a claim over which the federal courts have exclusive jurisdiction under Section 502(e)(1), 29 U.S.C. 1132(e)(1), or may such an action proceed in state court?

Is a state law action brought by a Plan Participant for an injunction barring an ERISA welfare benefit plan from enforcing its terms a claim for equitable relief pursuant to ERISA Section 502(a)(3), 29 U.S.C. 1132(a)(3), and therefore a claim over which the federal courts have exclusive jurisdiction under Section 502(e)(1), 29 U.S.C. 1132(e)(1), or may such an action proceed in state court?