If you go down to fig.# 46, you can see the main filter cap, actually two of them, designated C104-A and C105-A. If these dry out and lose capacitance it'll cause the shrunken raster and hum bar described earlier.
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Why wouldn't he fix it at the home? Thanks!
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To do a correct repair is a pretty involved process. It involves unsoldering multiple connections, untwisting the 'Twist-Lock' lugs that hold the capacitor can(s) in place, (sometimes) drilling out rivets, re-installing the new can(s) and re-soldering the leads back onto the correct section of the can (a single can can have up to four sections, designated A, B, C etc.). Although it `could` be done in the home, it would not be practical. Anything much beyond tube or fuse replacement was generally a shop job. Sometimes with a big heavy set or combo, the chassis was pulled to the shop, leaving the cabinet and pic tube in the home.
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As for the sneakers and hand in the pocket, the repair manuals I have say to do that. If no one ever did that, I won't have him doing it!!!!
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That's an obligatory precaution given to neophyte newbies and well worth the warning. But a seasoned techie such as depicted in your novel would not likely be seen working with one hand in pocket.
He might be wearing sneakers, but not specifically to avoid electrocution in the customer's home.