There is only one cable and it's attached in the middle on the bar/plate between both angles. I can drop description and refer to number on diagram I sent you.
The angles will also affect sliding since they lower the sunroof in the rear before it slides into the roof. Pratical speaking, angles are "streched" and this will make them to lower rear end.
I recommend to start by removing inner clothing and sunroof to examine what's broken.
'87 MBenz 190E 2,3 8vlv