03 opti 225.I have an overheat alarm going off sometimes only for a second and sometimes constant .dealer scanned it and said it was for sure overheat alarms. He changed the thermostat and the popit valve and the alarm still goes off. It seems that it happens more while getting on plane and running while trimmed up. If I let off the throttle the alarm will quit.also sometimes it just sounds for a second here and there while running. I have over 400 bucks into this problem already and could really use some help here please