2007 Seadoo GTI SE 155: Jet ski was running rough. Pulled the ski out of the water in running condition, maybe misfiring on 1 cylinder. Went to check spark & change plugs. Pulled all the plugs, loosely grounded them. 1st plug had yellow/blue spark. Then machine died. Now no beeps at all with key on post. Guages light up, no error codes. Fuel pump does not run. Have checked/replaced battery, fuses, start/stop switch, starter solenoid. Confirmed ECU is getting 12v from red/white power wire. Did checking the spark fry the ECU? Or the ignition coils? Is there a way to test the ECU to see if that's my problem before buying a used one & getting it married to my guages? Thanks!!