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 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.