1950s RCA B & W TV

[Captainclock]

Hello everyone today I've been tasked with repairing a 1950s vintage 14" B & W TV for a neighbor and it works perfectly except for the vertical stage, the bottom of the screen is not all the way to the bottom of the screen, and the top of the screen is stretched so that people's heads look like they're larger they they really are. Any ideas as to what would be causing that issue? it has seperate vertical amp and output tubes, which I'm thinking one of them might be bad possibly, but not sure. Its a cold chassis set, with VHF Only. I have some pictures I'll post of the set.