My wind sensor/display for my 4001 is on the fritz. The display reads 0, the cups are turning and there is voltage at the input terminals. If I unplug the unit for a few hours, then plug it back in, the wind speed will display for about 20 sec., then return to 0. Also, for a while, the wind direction indicator was erratic, going form about a 90 degree arc (N), then jumping directly to (S), then back to the North range. Resetting the unit seemed to solve this. All other functions are normal. I am suspecting a bad capacitor, resistor, transistor or CPU in the wind sensor path. I tend to lean towards the capacitor since the unit must sit for hours for the display to work for a couple of seconds (while cap charges?), while if I power up the unit soon after powering down, the display remains at 0. Any help or hints are appreciated! Mike M