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 grantee, at customers' request, from examining or
adjusting customers' receiving set to determine whether reception difficulties
originate in the set or in the grantee's system.