I am unsure of the exact situation currently but I believe that because of the spares supply situation gearboxes were being overhauled in Mesa rather that being sent to Kawasaki or offered as a straight swop. Part of the reason for that is/was the credit situation between MD and Kawasaki. The result is that a major gearbox fault can lead to the operator waiting for the gearbox to travel to Mesa, be rebuilt and returned. It all takes time. Maybe someone can update that information.
PANews, I suggest that if you are "unsure of the exact situation" that you keep your mouth shut!! Once again you post bogus, misleading information. Main Rotor Gearboxes were never overhauled in Mesa, and, were always offered as an exchange item. All gearboxes are overhauled at Kawasaki.
With the highest density of 900s in your area, there is absolutely no reason for you to be posting vindictive, incorrect rubbish. Go talk to the operators, before you post such c**p.