A few months ago I (foolishly) did some high speed driving on an Interstate highway. 40 or 50 miles at 90+ miles per hour. Ever since then I have noticed an increased whinning sound coming from under the hood. The whine is heard when the car is mixing power from the engine and battery. I wonder if the high speed driving could have damaged the HSD system? Has anyone else experienced this? I really dread taking this into the shop and have them try to fix it. I just don't know how much experience they have with HSD.