An image of the tank and plumbing would help as well.
No, it would not.
Here ya go. Does this help?
WAFI !!
Kurt you hit on a very useful test. Sound. Tap test.
Bravo!
Thermal expansion tank require periodic maintenance. As well, when you install a expansion tank it has to be pressurized and balanced with your domestic water supply pressure. Too much pressure can affect all the supply plumbing pipes in the home as well as appliances.
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Looks good from here…kinda…maybe…on second thought
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You’ve never been any help. OP" I have a 40 gallon electric water heater with an expansion tank installed." And you post a GN water heater. Lol.