Thread Hi-Jack:
I just had my FF quit. The automatic open wasn't. Nor would it close if I lifted the vent from above. So I took it apart.
First: getting the 8 little screws out to take off the screen for cleaning (obviously had never been done in 14.5 yrs) took a few seconds - what is the big deal?
Second: the failure was the pressed in axle that the lift arm rides on had flopped out, so once I found it, pounded it back into the housing, everything is back working properly. Total job time, including the much needed washing, 1/2 hour.