Section 2510 - Abolition of office or position1. If the board of education abolishes an office or position and creates another office or position for the performance of duties similar to those performed in the office or position abolished, the person filling such office or position at the time of its abolishment shall be appointed to the office or position thus created without reduction in salary or increment, provided the record of such person has been one of faithful, competent service in the office or position he has filled.2. Whenever a board of education abolishes a position under this chapter, the services of the teacher having the least seniority in the system within the tenure of the position abolished shall be discontinued.3.(a) If an office or position is abolished or if it is consolidated with another position without creating a new position, the person filling such position at the time of its abolishment or consolidation shall be placed upon a preferred eligible list of candidates for appointment to a vacancy that then exists or that may thereafter occur in an office or position similar to the one which such person filled without reduction in salary or increment, provided the record of such person has been one of faithful, competent service in the office or position he has filled. The persons on such preferred list shall be reinstated or appointed to such vacancies in such corresponding or similar positions in the order of their length of service in the system at any time within seven years from the date of abolition or consolidation of such office or position. Notwithstanding any other provision of law to the contrary, in the event that a member of the New York state teachers' retirement system, who is receiving a disability retirement allowance, shall have such disability retirement allowance rescinded, such member shall be placed upon such preferred eligible list as of the effective date of his or her disability retirement.(b) The persons on such preferred list shall be reinstated, in accordance with the terms of paragraph (a) of this subdivision, to such substitute positions of five months or more in duration, as may from time to time occur without losing their preferred status on such list. Declination of such reinstatement shall not adversely affect the persons' preferred eligibility status.