If a customer reports trouble on a line, a LEC shall, without charge to the customer and by use of whatever means necessary, determine whether the trouble is on the LEC or customer side of the network interface. For a LEC subject to an alternative form of regulation plan on January 1, 2006, this section shall not be effective until the expiration of its alternative form of regulation plan.

[17.11.16.31 NMAC - N, 2-1-06]