Why did you need to remove the pulley to begin with flu?
When I was fresh out of college my transmission went bad on my Toyota station wagon, so I took it in after opening the drain pan and closing it back up. They told me I needed a new transmission for like $800 or so, so I said go ahead. After getting it back I later (like almost a year later) checked the drain pan and found the same filter with a tear in it inside. I wanted to sue but then thought I had agreed to the price and it was working (kept working til I sold it many years later), still feel like I was lied to and cheated though.