Thanks for the response. We haven’t watched the engine when starting but I dont think it is even turning when the failure occurs. Yesterday when trying do the slow turning locally out on the engine we couldnt get it to rotate. We pulled the spark plug on A1 and had air blowing out, put it back in, pushed the slow turning solenoid in, heard air flowing but no rotating of the engine was happening. We had swapped out the main starting valve just to eliminate it, didn’t help.