Here's some info from the Company's internal news written by Montie Brewer:

"We had some reliability issues with the Embraer 190, which affected the 190 performance and also took manpower away from other aircraft thus impacting the performance in the rest of the fleet. Some of the solutions that are being implemented to address this problem include a modification program for the 190s underway in Calgary and Nashville, and keeping a spare Embraer aircraft to help us maintain schedule integrity. Embraer has a number of people in Calgary to assist us with the mod program – the first phase of which will be complete by the end of March and this should have a positive impact on our reliability."