Is not only ATF that can cause the Gear Problems, it could wiring system that had been tempered with by rat, so you need to conduct proper physical inspection with the aid of reading the wiring diagram in All-data to ascertain it or sometime the Car owner may not be mindful about liquid around Shift area, which can drop and cause damage to some circuit or bridging it. Sometime the Strainer filter may be block with dirt, you need to remove it and wash it with liquid (Kerosene), and you must fix the gearbox that day, not overnight.

[b]It depend on the time you are looking for the Vulcanize-rs, because some of them are staying very from their place of business, and it took them time to reach their destination, as some cannot afford accommodation that area.