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.