From what I have heard, the Crossfire uses a mercedes 722.6xxx transmission. Caveat: everything I will say here is based on that assumption.

You could have ohmed out all the solenoids on the solenoid valve body right from the connector on the 13 pin connector on the transmission housing (2 inch round connector with a 1/4 turn twist lock) or , from the Transmission Control Unit. Off-course you would have needed some schematics for that. I recommend you get yourself a $25 a year subscription to the alldata diy website. If they have info for the Crossfire great, if not , you can buy a subscription for any of the W210 benzes with automatic transmission. There is a post here from me from November of last year where I attached the interconnect diagram for the TCU, which may be a start for you.

The two "magnets" you are describing are Hall effect sensors (one for the input , one on the output shaft) that pick up the speed of the encoder wheels passing by in close proximty. If you look upwards into the transmission with the valve body removed, you will see the two round holes that line up with the hall effect sensors and inside them the encoder wheels.