After the discovery of a malfunction in the tabulating equipment at a central counting station, which malfunction caused the results to be incorrect as provided for in the Texas Election Code, §127.129, the presiding judge of the central counting station shall follow the procedures set out in §127. 098(c) and (d). If the presiding judge determines that obtaining a valid automatic count is impracticable, the ballots shall be counted manually, and the presiding judge shall execute and attach a certificate to the returns stating that the ballots were counted manually and stating the nature of the equipment malfunction which led him to the determination that the ballots would be counted manually.