Conn. Agencies Regs. § 9-242-21
The factory engineer shall be provided with access to all components of the electronic voting equipment. However, the local election officials may designate one or more watchers trained in the operation of the system to oversee the work of the factory engineer. Factory engineer maintenance tasks shall be limited to complex and infrequent maintenance functions which require access to proprietary firmware or specialized facilities and equipment which cannot be obtained by the purchasing municipality. The punchcard and marksense voting systems shall be designed and constructed so as to minimize factory service. Factory maintenance tasks shall number not more than two percent of all maintenance tasks and their frequency shall not exceed five percent of the total frequency of all preventive maintenance tasks.
Conn. Agencies Regs. § 9-242-21