236.3. Sections 29, 83, 85, 116 to 121 and 209, as they read before 1 January 1989, continue to apply to a pensioner or person who, before that date, participated in the plan or notified the Commission in writing of his intention not to participate in the plan, until he ceases to hold his employment or, in the case of section 116, until he reaches 65 years of age, whichever occurs first. The same rule applies, but only as regards the provisions of section 117 which concern the interruption of payment of pension benefits and, with respect to the other sections, only as regards the provisions which concern the period during which employment is held, to a pensioner or person referred to in section 117 who, before 1 January 1989, did not participate in the plan or did not notify the Commission in writing of his intention not to participate in the plan, as long as he has not ceased to hold his employment.