The retrace lines can be caused by excessive screen voltage. Flip the set into service mode and see if you have a bright white line. if so, quickly turn down the screens until its all black.
Turn up the red until you see a faint red line, then turn up blue until you see magenta, then turn up green until you see a gray line. flip the switch back to normal, adjust brightness and see if your retrace remains. Also clean the service switch. Sometimes oxidized contacts will cause strange symptoms your having.
As far as the noise you hear, sounds like corona discharge. Open up the high voltage cage and clean out all the dust you can. A faulty high voltage rectifier heater winding can also cause this symptom. Turn the set on in a darkened room with the HV cage open and see if you can see a blue haze --indicating the corona discharge. Also clean all surfaces around high voltage components. This includes the HV cage, horzontal output tube, damper tube, HV regulator (this set may not have one) and rectifier tube, as well as the bell of the picture tube.
Good luck with your sets. Zenith color sets are some of the finest.
BTW, where are the pics?
