What kind of contamination??? Dirt? Coolant? Incorrect fluid? Something
else?

I had to get $3000.00 worth of work done on my vehicle.  To remove check
and install it cost 425.00 Cootman Premium Service was 1031.69
16 rebuild labor was 1192.00 and 1 torque converter 325.00.  These are the
comments that were on my order.24 month or 24,000 miles whichever comes
first.  Vehicles under carraiage was completely rusted as if it was
flooded many parts had to be replaced due to breakage during removal of
transmission increasing the price.