The Mesa 2 NT cabinet is an older cabinet made by Marconi, now Emerson, and is supported by Emerson’s Tech Support. Although there may be ADTRAN equipment in the cabinet, the enclosure, environmental control system, heat exchanger, intrusion alarms and other, cabinet-specific equipment is covered by the Emerson warranty and their Tech Support personnel. Below is the Emerson Tech Support contact information.
Emerson Tech Support
OSP Tech Support Manager
4350 Weaver Parkway
Warrenville, IL 60555
Unfortunately Tony is no longer there but I opened a request with them online: