Prohibited activities. In the conduct of its business
franchised hereunder, neither the grantee nor its officers, employees or agents
shall directly or indirectly sell, lease, repair, install or maintain television
sets or receivers or antennas; provided, however, that nothing hereunder shall
prohibit the grantee, at customer's request, from examining or adjusting
customer's receiving set to determine whether reception difficulties
originate in the set or in the grantee's system.