1999 Mitsu VS-45605, s/n 110524. Have intermittent horz jitters across upper 1/2 of screen. Happens randomly for 5 sec to 45 seconds at a time, at times it's un-watchable! At most times it's normal. Removed entire circuit board and a detailed insp. reveals no bad solder joints, no leaky caps, no corrosion. I heard of a mod to bypass PIP circuit.... any info on this? Any help appreciated!!! Thanks, RW