As to the question of MEL's and a SOM, I can say first hand that Barrier's Islanders on Horn Island were operated using both of these. Not sure of the couple that were leased, if they were the same. The Barrier SOM was I believe from my poor memory was based on the Manufacturer's recommend system of maintenance.
As to the said former employee, some of your current rumoured actions in regard current employees is despicable and bordering on the illegal and I pray that they are not true.
I hope that all can be resolved soon, with Barrier given every opportunity to return to the air.