[Elecraft] Big No-No!

[k8rs]

      Well. I've done it!  The big No-No!  I plugged a regular 9-pin RS-232 cable into my K2/100. and smoked my K2/100's serial port.  A moment of forgetfulness during setup for the recent ARRL VHF QSO Party led to this stupid mistake.
     OK, what did I do? And what parts do I need to fix this mistake?  
     I have some time while on vacation the next few weeks, so I want to get going.  Help and advice needed!
                              Roger K8RS K2/100 #3478