Sec. 201 Notification of extent to which health benefits can be modified or terminated
“(n) In the case of a suit brought under this title by a participant or beneficiary relating to benefits of a retired employee or the dependents of a retired employee under a group health plan (as defined in section 733(a)(1)), the presumption for purposes of such suit shall be that as of the date an employee retires or completes 20 years of service with the employer, benefits available under the plan during retirement of the employee are fully vested and cannot be modified or terminated for the life of the employee or, if longer, the life of the employee's spouse. This presumption can be overcome only upon a showing, by clear and convincing evidence, that the terms of the group health plan allow for a modification or termination of benefits available under the plan and that the employee, prior to becoming a participant in the plan, was made aware, in clear and unambiguous terms, that the plan allowed for such modification or termination of benefits.”