Hello all, this is my first post and I am hoping someone may be able to help me. I am working on my father-in-law's 300cd and have traced a short to the #2 circuit. I am curious if there are any known common failures or shorts in this circuit. The circuit contains:
clock, trunk light, roof lights, diagnostic, switch-over valve seat back arrestor, hazard warning system, auto antenna, illum. vanity mirror, warning monitor term. #5, (electronic radio)

The only things I can tell that have been done to this fine car is a kenwood stereo was put in, but I think this problem is more recent than that.
Also, what is a "switch-over valve seat back arrester"?

Thank you