Whenever a change in the records, while still in the possession of the licensed technician, is necessary, the original entry on the records shall be marked out with a single stroke of the pen without defacing the figure and the correction noted immediately adjacent to the original entry. The change shall be identified by the initials of the technician, which are to be written on the record immediately adjacent to the correction. When necessary changes are made on the original test sheet, such changes shall be made only by the licensed technician.