I have been through a similiar ordeal - although I am not a tech, or anything beyond an overoptimistic enthusiast.
http://www.peachparts.com/shopforum/showthread.php?t=177808
http://www.peachparts.com/shopforum/showthread.php?t=177973
Still arguing with all the people I should be listening to that I must use protocol for reset. Will undoubtedly spend far more time & money than merited. I'm a little stubborn that way.
Anyway, during this process a sympathetic shop foreman turned his head while I dug through some discared valve bodies (I never wished I drove a truck more than that moment). I may have the part you are looking for. PM me with more specific ID. Also, check out the parts list from chrysler(Don't know if the C280 shares any trans parts with my CLK's 722.607,but I would not be surprised).
http://www.gleamingedge.com/mirrors/Crossfire/Crossfire%20Service%20Manual.pdf
Be patient, this is a huge file (80MB, 3K pages - but worth the wait).
PM me with info on your clip.