Entertainment Center: TVs, Stereos, VCRs and DVDs - Zenith projection tv problems

I have a Zenith IQC50H95W (or 94W--unsure) that I just started having problems with. The blue is bowed down from the top of the screen. I tried to adjust the convergence (red is fine, blue is ok vertically, and most of the way horizontally, but the blue vertical line does not continue all the way to the top as do the other colors. I had an older Zenith set last year that pincushioned and the repair people in our area wanted 100-150 to diagnose, amount to be waived if set was repaired, so I bought this unit. I am trying to see if this is worth fixing and a ballpark idea for a reasonable repair amount should be. Any help would be greatly appreciated.