Well, oddly enough, before we changed fuel clusters it wouldn't pop with the intake cowling off!! I guess P&W do say that these birds do have a problem with the intake system with the 3D engines.
Anyways, got word back from the P&W guys and our Bell Rep. They have concluded that our "surge margin" in the engine was too close and it was running too rich. This was evident because we pulled one fuel nozzle and it was covered in black powdery carbon!
So the decision was to pull the engine and replace it. I'm just glad that i'm not forking the bill for this mess. Thanks for the input.