Unfortunately, if it has the pattern in the SDI stream it means it is coming from the CCD or something near to it in the circuit. There is remote possibility it is noise on the supply line but that would tend to show more on the composite output than the SDI output. You really need a schematic and a good oscilloscope to investigate this fault but don't get your hopes up, if it's the CCD or one of the LSI devices it may be impossible to get replacements and/or solder them.
Brian.