If you drop the transmission pan, the magnet is your best storyteller. : A fine gray "fuzz" on the magnet is expected.

: Mechanics often post videos or photo sequences of using a 9V battery to trigger the solenoid, checking for that healthy "click" sound. Pan Magnet Inspection

Always use a dedicated transmission funnel. It is longer and narrower, preventing spills on hot exhaust manifolds that cause smoke and odors.

One of the most common "tricks" involves a complete DIY fluid exchange rather than a simple drain. Pictures of this process often highlight the stark contrast between burnt, brown old fluid and the vibrant translucent red of fresh ATF.