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I did it by inspection. Don't be discouraged, the service manual isn't a help. It tells you the steps, but leaves out info on the joints. When you first look at the two valves, you will swear that one of them is cemented to the tank and you can't remove it. As I recall, you can remove both valves.
However, look at the replacement parts. You will see that the new seal is only on one side. If you dissassemble the valves (one of them, I recall) and leave the other half connected to the tank, you can fix it because the half that comes out is the half that needs replacing.
When you do this, you can get the entire other valve out. Just be warned that the operation takes some corner screw drivers, like the Craftsman ratchet screwdriver (there are others) that takes only about 5/8" clearance to get to a screw head.
Zep
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