New TSB on transmission leaks TSB 05-14-5 that might apply to a few past posts.

ISSUE
Some 2000-2005 Taurus/Sable, 2000-2003 Windstar and 2004-2005 Freestar/Monterey vehicles, equipped with a 4F50N, AX4N or AX4S transaxle, may exhibit an erratic fluid level reading on the transaxle dipstick and possible leaks around the filler tube and grommet. The condition may be due to the transaxle vent. The vent has a rubber disk under the metal cap to prevent water from entering the transaxle. This rubber disk may intermittently stick and cause improper venting.

ACTION
Replace the vent with the previous design vent stem, and rubber vent cap.