Regulation 37—Record keeping of transmission lineAn operator shall maintain records for transmission lines as follows(a) the date, location and description of each repair made to a pipeline shall be retained for as long as the pipe remains in service;(b) the date, location and description of each repair made to any part of a pipeline system shall be retained for at least five years, except for a repair generated by a patrol, survey, inspection or test required under the Eleventh and Twelfth Schedules; and(c) a record of each patrol, survey, inspection, and test required under the Second to Twelfth Schedule shall be retained for at least five years or until the next patrol, survey, or test is completed, whichever is longer.