N.Y.C. Admin. Code § 28-303.7.1: § 28-303.7.1 Affirmation of correction.

All defects identified in the annual boiler inspection report shall be corrected within 90 days after the date of initial inspection. The department may grant an extension of 45 days upon submission of an application by the owner demonstrating a practical difficulty in complying within the 90 day timeframe. In no case shall a single extension request be granted for more than 45 days, and no more than two such extensions be granted for a specific defect. An affirmation of correction shall be filed within 14 days of the date of correction.