Montgomery Ward problem

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Finally I have a real question to ask…

This guy in my building has this Montgomery Ward TV that’s lost horizontal hold. He told me when he found the set, it had the same problem, he took it to a friend and the guy replaced the tuner. The guy replaced the tuner and the TV set worked but afterward, he said it would lose horizontal hold and come back after being on for 5 minutes, now the set won’t normalize.

I went by his place and it’s doing exactly what he described. At first I thought maybe the yoke or horizontal amplifier went, but I notice that the OSD is displaying text on the screen with no problems, that leaves me to think it’s the tuner… The set is connected to the house’s cable, when I disconnected it, it would regain horizontal hold and display snow.

The set is 27” branded as Montgomery Ward, however the picture tube is made by Zenith.

I’m not sure where to start looking since its showing signs it’s the tuner…