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I would have to guess that the TV was dropped or banged, which caused a bend in the shadow mask inside the CRT. Very common on those later model CRT sets. All you can do, is as Eric says, loosen the yoke and tilt it to correct the tilt, but that may throw the convergence off worse, or if you're super-lucky, it could correct it. Don't mess with the adjustment rings on the yoke, as those are very tricky. The two closest to the front of the TV are purity, and the other two or four closer to the socket, are center convergence. The edge convergence is done with permanent magnets on the outer shell of the CRT, if needed. Usually those smaller sets don't require edge convergence, which is why I suspect physical damage. The edge convergence is also affected by putting small wedges between the yoke and the flare of the CRT, to cock it up/down and back/forth slightly. But that would not affect corner convergence; it affects the whole top and bottom edges, and whole left and right sides.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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