Zenith System 3 trouble...any suggestions?

[truetone36]

I brought home a Zenith System 3 combo as part of the huge stash of t.v.s and radios I got from my landlord. It has a problem. When I powered the t.v. up, the raster didn't cover the top and right side of the screen. It also started to make a popping noise as if something was arcing, so I immediately shut it down. This is a nice set. Model #SL2597P, chassis #3WR12X, manufactured in August 1979. It has all manuals and paperwork as well as the original hang tags. I have one other issue with it, I need a Space Command 2000 remote w/zoom. Does anyone know where I might find one? All components besides the t.v. work fine. I'd appreciate any info from anyone familiar with these. Thanks in advance.