RCA MM32110, MM36110, MM36100 - getting rid of the horizontal white line?

After I do the "anamorphic squeeze" in the service menu by adjusting vertical size and the parabola presets, I get an annoying horizontal white line at the top of the screen. This is with both, RGB or Component inputs from HDTV and computer sources. What is weird is that the line does not appear when those sets are first turned on. Only about a 2-3 seconds later when all the picture circutry comes alive this line appears. Any way to get rid of it? (short of removing the squeeze and go back to 4:3 thus pushing the line off of the screen?)


Thanks,

Leszek