BR, the Gen Load on the engine going to idle is going to increase drastically if the MAIN BUSES are separated. Setting the BUS TIE switch to the ON position shall connect the Main Busses distributing the load evenly.
In the latest RFM revision, AW has changed the ENG CHIP malfunction procedure. The procedure now requires the engine to be shut down only with secondary indications of breakdown (Oil pressure falling, Temperature increasing, Noise, Vibrations, pieces falling off...) and it can be brought up to flight for landing if needed lacking those indications.
Hope this Helps.
Keep the blue side up...unless it's the water.