I haven't seen anything like this, but am interested.
Did the tech determine whether the whine is coming from the engine or
transmission? I.e., does it happen only at certain rpm's, or only in
certain gears. An engine noise would tend to be rpm dependent, but
reproducible in all gears. A transmission noise, on the other hand, is
likely to either be related to vehicle speed or change depending on the
gear, but occur over a broad range of engine rpm's.
It's a possibility that the noise is a normal occurrence from either the
engine or transmission that transmits excessively to the passenger
compartment. These types of noises can often be effectively reduced by
installing vibration dampers in strategic locations. Some early Santa
Fe's had a transmission whine that was lessened by installing a damper on
the shift cable.